COMMTOUCH SOFTWARE LTD
POS AM, F-3/A, 2000-07-27
COMMUNICATIONS SERVICES, NEC
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       As filed with the Securities and Exchange Commission on July 27, 2000
                                                      Registration No. 333-89773

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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                 ---------------
                                 POST-EFFECTIVE
                                 AMENDMENT NO. 1

                                   ON FORM F-3

                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933

                             COMMTOUCH SOFTWARE LTD.
             (Exact name of Registrant as specified in its charter)
<TABLE>
<CAPTION>
<S>                                       <C>                                            <C>
                Israel                             7389                                  Not Applicable
   (State or other jurisdiction of        (Primary Standard Industrial                  (I.R.S. Employer
   incorporation or organization)         Classification Code Number)                   Identification No.)
</TABLE>


                                6 Hazoran Street
                      Poleg Industrial Park, P.O. Box 8511
                              Netanya 42504, Israel
                               011-972-9-863-6888
   (Address and telephone number of Registrant's principal executive offices)


                               c/o Commtouch Inc.
                   James E. Collins, Chief Financial Officer
                         3945 Freedom Circle, Suite 400
                          Santa Clara, California 95054
                                 (408) 653-4330

   (Name, address and telephone number of agent for service) (See explanatory
    note)

<TABLE>
<CAPTION>

                                   Copies to:
<S>                           <C>                            <C>                             <C>
   Lior O. Nuchi                 Aaron M. Lampert             Keith Dolliver                    Francis J. Feeney, Jr.
  Venrice R. Palmer               Noga Devesceri              Spira Microsoft                Corporation David M. Barbash
Irene Song Sharkansky         Naschitz, Brandes & Co.        One Microsoft Way               Hutchins, Wheeler & Dittmar
  McCutchen, Doyle,              5 Tuval Street              Redmond, WA 98052                A Professional Corporation
Brown & Enersen,  LLP         Tel Aviv 67897 Israel                                               101 Federal Street
  3150 Porter Drive                                                                          Boston, Massachusetts 02110
Palo Alto, CA 94304
</TABLE>

        Approximate date of commencement of proposed sale to the public:
      From time to time after the Registration Statement becomes effective.

    If the only  securities  being  registered  on this form are  being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. [ ]

    If any of the securities  being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, please check the following box. [X]

    If this Form is filed to  register  additional  securities  for an  offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. [ ]

    If this Form is a  post-effective  amendment  filed  pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

    If delivery of the  prospectus  is expected to be made pursuant to Rule 434,
please check the following box. [ ]

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--------------------------------------------------------------------------------



<PAGE>








                                Explanatory Note

After July 31, 2000, the address of the agent for service will be:


                               c/o Commtouch Inc.
                    James E. Collins, Chief Financial Officer
                               2029 Stierlin Court
                      Mountain View, California 94043-4655


<PAGE>



Commtouch Software Ltd.

2,052,051 Ordinary Shares
Warrant to Purchase 1,136,000 Ordinary Shares
1,136,000 Ordinary Shares Issuable Upon Exercise of Warrant

[GRAPHIC OMITTED]



--------------------------------------------------------------------------------

    As we described  further below under "Plan of Distribution,"  Go2Net,  Inc.,
Vulcan   Ventures   Incorporated   and   Microsoft   Corporation,   the  Selling
Securityholders  identified in this  prospectus,  are selling up to 2,052,051 of
our ordinary  shares.  Go2Net is also selling a warrant and  1,136,000  ordinary
shares which may be acquired upon exercise of the warrant.  These securities may
be offered from time to time by the Selling  Securityholders  through  public or
private transactions, on or off the Nasdaq National Market, at prevailing market
prices or at  privately  negotiated  prices.  The Selling  Securityholders  will
receive all of the proceeds  from this  offering  and will pay all  underwriting
discounts  and  selling  commissions,  if  any,  applicable  to the  sale of the
securities.  We will pay the  expenses of  registration  of this  offering.  The
Company has agreed to  indemnify  the Selling  Securityholders  against  certain
liabilities,  including liabilities under the Securities Act of 1933, as amended
(the "Securities Act").

    The  ordinary   shares  and  warrant  are  being   offered  by  the  Selling
Securityholders  subject  to prior  sale and  subject  to their  right to reject
offers in whole or in part and to certain other conditions.

    Our ordinary shares are currently traded on the Nasdaq National Market under
the  symbol  "CTCH."  On July 24,  2000,  the last  reported  sales  price of an
ordinary share on the Nasdaq National Market was $24.44 per share.

    The Selling  Securityholders  may be deemed to be "underwriters"  within the
meaning of the Securities Act and any profits  realized by them may be deemed to
be  underwriting  commissions.   Any  broker-dealers  that  participate  in  the
distribution  of  ordinary  shares  or the  warrant  also  may be  deemed  to be
"underwriters,"  as  defined  in the  Securities  Act,  and any  commissions  or
discounts  paid to them, or any profits  realized by them upon the resale of any
securities  purchased by them as  principals,  may be deemed to be  underwriting
commissions  or  discounts  under the  Securities  Act. The sale of the ordinary
shares and the warrant is subject to the prospectus delivery requirements of the
Securities Act.

    The  ordinary  shares and the warrant  offered  hereby have been  registered
pursuant to registration  rights granted to the Selling  Securityholders  by the
Company.

    Our initial public offering occurred on July 16, 1999.
--------------------------------------------------------------------------------
     This investment involves risk. See "Risk Factors" beginning on page 3.
--------------------------------------------------------------------------------

    NEITHER THE  SECURITIES  AND EXCHANGE  COMMISSION  NOR ANY STATE  SECURITIES
COMMISSION HAS APPROVED OF ANYONE'S INVESTMENT IN THESE SECURITIES OR DETERMINED
IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE.  ANY  REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.

                  The date of this Prospectus is       , 2000


<PAGE>


                                TABLE OF CONTENTS


                                                                            Page
                                                                           -----
Summary ....................................................................   1
Risk Factors ...............................................................   3
Use of Proceeds ............................................................  13
Selling Securityholders ....................................................  14
Description of Share Capital ...............................................  15
Shares Eligible for Future Sale ............................................  21
Plan of Distribution .......................................................  22
Legal Matters ..............................................................  23
Experts ....................................................................  23
Where You Can Find More Information ........................................  23
Information Incorporated by Reference ......................................  24
Enforceability of Civil Liabilities ........................................  25



                         -------------------------------

You should rely only on the information  contained in this  prospectus.  We have
not authorized any other person to provide you with different information.  This
prospectus  is not an offer to sell,  nor is it seeking  an offer to buy,  these
securities  in  any  state  where  the  offer  or  sale  is not  permitted.  The
information  in this  prospectus  is complete and accurate as of the date on the
front cover, but the information may have changed since that date.



                                        i



<PAGE>



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                                     SUMMARY

This summary  provides an overview of selected  information and does not contain
all the information  you should  consider.  Therefore,  you should also read the
more detailed  information set out in this prospectus,  the financial statements
and the other information incorporated by reference into this prospectus.

Unless  otherwise  indicated,  all references in this prospectus to "Commtouch,"
"the  Company,"  "we,"  "us" or "our"  are to  Commtouch  Software  Ltd.  or its
wholly-owned subsidiaries,  Commtouch Inc. and Commtouch (UK) Ltd. Except as set
forth  in  the   Consolidated   Financial   Statements  and  the  Notes  thereto
incorporated by reference herein, or as otherwise indicated,  all information in
this prospectus assumes the issuance of 368,270 ordinary shares upon the assumed
net  exercise at an assumed  share price of $18.94 per share of an  in-the-money
warrant to  purchase  1,136,000  ordinary  shares  issued to Go2Net,  Inc. at an
exercise price of $12.80 per share.



Commtouch

We are a leading global  provider of outsourced  integrated  Web-based email and
messaging   solutions  to  businesses.   Our  solutions  are  flexible,   highly
customizable  and enable us to satisfy the unique email and  messaging  needs of
our customers worldwide.  Our customers are large and small businesses who offer
our Web-based email through their websites to their end users and employees.

Email is one of the most widely used applications on the Internet and has become
a primary  platform  for  business  and  personal  communication.  According  to
Forrester Research,  over 80% of Internet users access their email while online,
making this  activity the most popular use of the Internet.  International  Data
Corporation  estimates  that at the end of 1999  there  were  over  180  million
emailboxes  in the  United  States  and over 130  million  outside of the United
States.  IDC projects  that by the end of 2003,  these  numbers will increase to
over 280 million emailboxes in the United States and over 305 million emailboxes
outside the United States.

As of  December  31,  1999,  we had  over  250  global  customers.  Through  our
customers' sites we serve  approximately 8.4 million active emailboxes.  We also
serve over 1.0  million  active  emailboxes  to small  businesses  and  websites
through our ZapZone  Network.  Our  comprehensive  Web-based email and messaging
solutions offer the following benefits:

*   Extensive email features.  Our services are easy to use, and include a broad
    set of email  capabilities,  including a highly integrated  contact book and
    calendar.

*   Ability  to  support   hundreds  of  millions  of  emailboxes.   Our  system
    architecture and software platform have been designed to support hundreds of
    millions of emailboxes across millions of domains while maintaining a highly
    reliable service.

*   Customization.  Our customers use our proprietary customization tool to make
    the look and feel of their Web-based  email interface  consistent with their
    own brand image.

*   Rapidly  deployable  and  cost-effective  solutions.  Our  solutions  can be
    quickly  implemented  and can save our  customers the  significant  costs of
    developing and maintaining an email service in-house.

*   Extensive  language  capabilities.  Our email  services are  available in 18
    languages. Additionally, we can support more than one language on any of our
    customers' websites.

*   Increased website usage. We believe that our services increase the frequency
    and duration of users' visits to our customers' websites.

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                                        1


<PAGE>

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*   Online marketing capabilities. Our customers and third parties selling goods
    and  services   online  can  leverage  our  services  and  the   demographic
    information  of our end users to conduct  one-to-one  direct  marketing  and
    targeted advertising campaigns.

Office Location

Our  principal  executive  offices  are  located  at  6  Hazoran  Street,  Poleg
Industrial  Park,  Netanya  42504,   Israel,   where  our  telephone  number  is
011-972-9-863-6888, and 3945 Freedom Circle, Suite #400, Santa Clara, California
95054,  where our telephone number is (408) 653-4330.  Our website addresses are
www.commtouch.com and www.zzn.com.  The information contained on our websites is
not a part of this prospectus.

<TABLE>
The Offering
<CAPTION>
<S>                                                        <C>
Ordinary shares offered ................................   2,052,051 shares

Warrant to purchase shares .............................   1,136,000 shares

Shares available on exercise of warrant ................   1,136,000

Ordinary shares outstanding after the offering .........   16,415,069 shares

Use of proceeds ........................................   We will not receive any of the proceeds
                                                           from the sale of the shares or the warrant
                                                           by the Selling Securityholders in this
                                                           offering.

NASDAQ National Market Symbol ..........................   CTCH
</TABLE>
------------

Except  as set  forth in the  Consolidated  Financial  Statements  and the Notes
thereto incorporated by reference in this prospectus and as otherwise specified,
all information in this prospectus is based on the number of shares  outstanding
as of May 31, 2000, and:

    * assumes  the  issuance  of 368,270  ordinary  shares  upon the assumed net
      exercise at an assumed share price of $18.94 per share of the in-the-money
      warrant to purchase  1,136,000  ordinary  shares  issued to Go2Net,  at an
      exercise price of $12.80 per share;

    * assumes the issuance of 397,580  ordinary shares issuable upon exercise of
      options granted to executive  officers and directors within 60 days of May
      31, 2000 at a weighted average exercise price of $24.20 per share.

    * with respect to financial  information,  is reported in U.S. dollars;  and
      does not include:

    * 2,042,261  ordinary  shares  issuable to employees  and  consultants  upon
      exercise of  outstanding  options  under our stock  option plans and stock
      option  agreements as of May 31, 2000 at a weighted average exercise price
      of $22.57 per share; and

    * 2,022,684 ordinary shares available for future grant or issuance under our
      stock option and stock purchase plans as of May 31, 2000.



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                                        2


<PAGE>

                                  RISK FACTORS



You should  carefully  consider the following  risk factors before you decide to
buy our ordinary shares.  You should also consider the other  information in and
incorporated  by reference into this  prospectus.  If any of the following risks
actually occur, our business,  financial  condition,  operating  results or cash
flows could be materially adversely affected. This could cause the trading price
of our  ordinary  shares  to  decline,  and you  could  lose part or all of your
investment.

This  prospectus  contains  forward-looking  statements  that involve  risks and
uncertainties. These statements relate to our future plans, objectives, beliefs,
expectations  and intentions.  In some cases,  you can identify  forward-looking
statements  by our use of words such as  "expects,"  "anticipates,"  "believes,"
"intends,"  "plans," "seeks" and "estimates" and similar  expressions.  You will
find  forward-looking  statements under the captions  "Summary," "Risk Factors,"
"Use of  Proceeds,"  and  elsewhere  in  this  prospectus  and  the  information
incorporated by reference into this  prospectus.  Our actual results,  levels of
activity, performance or achievements may differ materially from those expressed
or implied by these  forward-looking  statements.  Factors  that could  cause or
contribute to these  differences  include those discussed below and elsewhere in
this  prospectus  and  the  information  incorporated  by  reference  into  this
prospectus.


Risks Relating to the Company

Because  we have a  limited  operating  history  as a  Web-based  email  service
provider, it is difficult to evaluate our business and prospects.

We commenced  operations in 1991, but we began  commercially  selling  Web-based
email services only in 1998 after changing our strategic focus from the sale and
service of stand-alone email client software products for mainframe and personal
computers.  This change  required  us to adjust our  business  processes  and to
restructure  Commtouch to become a Web-based email service provider.  Therefore,
we have only a limited  operating  history  as a  provider  of  Web-based  email
services upon which you can evaluate our business and prospects.

We have a history of losses and may never achieve profitability.

We incurred net losses of  approximately  $3.5 million in 1997,  $4.4 million in
1998 and $19.9 million in 1999.  As of December 31, 1999, we had an  accumulated
deficit of approximately  $31.5 million.  We have not achieved  profitability in
any period,  and we expect to  continue to incur net losses for the  foreseeable
future.

We have invested heavily in technology and infrastructure development. We expect
to continue to spend substantial financial and other resources on developing and
introducing  new  service  offerings  and  expanding  our  sales  and  marketing
organizations,  strategic relationships and operating infrastructure.  We expect
that our expenses will continue to increase in absolute dollars. If our revenues
do not correspondingly  increase,  our operating results and financial condition
will be negatively affected.  We may never attain sufficient revenues to achieve
profitability.  If we do achieve  profitability,  we may not sustain or increase
profitability  in the  future.  This may,  in turn,  cause  our  stock  price to
decline.

Our future email services revenues are unpredictable and our quarterly operating
results may fluctuate and fluctuations  could adversely affect the value of your
investment.

Because we have a limited  operating history in the provision of Web-based email
services and because of the emerging  nature of the markets in which we compete,
our revenue is  unpredictable.  Our current and future  expense  levels are to a
large extent fixed.  We may be unable to adjust  spending  quickly to compensate
for any revenue shortfall,  and any significant  revenue shortfall would have an
immediate negative effect on our results of operations and stock price.

A number  of  factors,  many of which  are  enumerated  in this  "Risk  Factors"
section,  are  likely to cause  fluctuations  in our  operating  results.  Other
factors which may cause such fluctuations include:

    * the size, timing and fulfillment of orders for our email services;

                                        3


<PAGE>


    * the receipt or payment of irregular or nonrecurring revenues or expenses;

    * our mix of  service  offerings,  including  our  ability  to  successfully
      implement new services;

    * pricing of our services; and

    * effectiveness of our customer support.

Because of these factors,  period-to-period comparisons of our operating results
are not a good  indication  of our  future  performance.  It is likely  that our
operating results in some quarters will be below market expectations.

We have recently  changed our fee  structure and cannot  predict the effect this
change will have on our future  revenues.

In recent  months we have moved from a pricing  strategy  based  primarily  on a
share of  advertising  revenues with a minimum  annual  service fee to one based
primarily on charging a per-emailbox  fee with a minimum annual  commitment fee.
While we believe  that this new fee  structure  will result in a higher and more
predictable  revenue  stream  compared with one based on a share of  advertising
revenues,  we cannot predict  whether this new pricing  strategy will in fact be
successful in generating  higher and more predictable  revenues.  We may need to
change our pricing strategy again from time to time.

If the market for our Web-based  email  services does not grow rapidly,  we will
fail to generate revenues.

Our success will depend on the widespread  acceptance and use of Web-based email
by our  customers  as a means to  increase  the value of their  services or as a
means of  communication.  The market for  Web-based  email  services  is new and
rapidly  evolving.  We cannot  estimate the size or growth rate of the potential
market for our service  offerings.  If the market for  Web-based  email fails to
grow or grows more slowly than we currently anticipate, our business will suffer
dramatically.  Even if that market  grows,  our  service  may not achieve  broad
market acceptance.  Since we have only recently  introduced our services,  we do
not have  sufficient  experience  to evaluate  whether they will  achieve  broad
market  acceptance.  Also,  because  all of our  revenue is derived  directly or
indirectly from our Web-based email solutions, if that market does not grow, our
business will likely fail.

If we do not expand our sales and marketing  organization we will not be able to
increase our revenues.

Our ability to increase our revenues will depend on our ability to  successfully
expand our sales and  marketing  organization.  The  complexity  of our Internet
messaging services and the emerging nature of the Web-based email market require
highly trained sales and marketing  personnel to educate  prospective  customers
regarding  the use and benefits of our  services.  The majority of our sales and
marketing  personnel  have  only  recently  joined  Commtouch  and have  limited
experience working together.  It will take time for these employees to learn how
to market  our  solutions  and to be  integrated  into our  sales and  marketing
organization.   Some  of  them  may  not  succeed  in  making  this  transition.
Additionally,  we are planning to introduce  additional services that we have no
experience  marketing  and will rely on these  services to produce a substantial
portion of our revenues in the future.  As a result of these factors,  our sales
and marketing  organization may not be able to compete  successfully against the
bigger  and  more   experienced   sales  and  marketing   organizations  of  our
competitors.

Even if our email services are successful with our customers,  we may not derive
revenue from the users of the emailboxes,  which would prevent our business from
growing.

Even if our services are a success with our customers, we will not succeed if we
do not derive revenue from the email users that our customers give us access to.
We plan to derive  revenue  from these email  users  primarily  by charging  our
customers per-emailbox fees for our email services, as well as by selling access
to email users for direct marketing services and from the sale of advertisements
that the email  users will see. If one or more of these  revenue  sources is not
successful, we will not succeed. To

                                        4



<PAGE>

date,  we have  generated  only  limited  revenue from these  potential  revenue
sources and they may not be successful. Our existing and potential customers may
not be willing to pay for our email services.  Advertisers and direct  marketers
may not accept email as a means of placing  advertisements and conducting direct
marketing and email users may not want to receive direct marketing materials.

Our ability to generate revenues from the emailbox base that our customers bring
to us also  depends  on the  emailboxes  being  used on a regular  basis.  On an
ongoing  basis,  many of our end users will not regularly use their  emailboxes,
and a significant number will cease using our services each month.  Accordingly,
there may be no  relationship  between the number of active  emailboxes  and our
revenues.

We have a  strategic  relationship  with  Go2Net  pursuant  to which we issued a
warrant  to  Go2Net  that  diluted  our  shareholders,  but we may  not  realize
substantial  revenues  or  other  business  benefits  from  this or any  similar
transaction.

We entered into a strategic  relationship  with Go2Net  simultaneously  with the
closing of our initial public offering.  Our Customized  Web-Based Email Service
Agreement  with Go2Net  provides  that we share  revenues from  advertising  and
premium  services  offered to Go2Net's end users through our email service.  The
terms of this agreement are substantially the same as our commercial  agreements
with other  customers  except that we have  agreed  that  Go2Net will  receive a
materially greater portion of advertising  revenues than other customers receive
under other similar agreements. As part of this transaction, we issued to Go2Net
a warrant to purchase up to 1,136,000  ordinary  shares at an exercise  price of
$12.80 per share.  This warrant is  exercisable  at any time until it expires on
July 16, 2004. We agreed to register  these  shares,  the warrant and the shares
issuable  upon  exercise  of  the  warrant  with  the  Securities  and  Exchange
Commission and the registration  statement  relating to those securities  became
effective  on January 7,  2000.  Exercise  of the  warrant  will cause  existing
investors significant dilution.  However, we may not realize any revenues or any
other business benefits from this strategic  relationship with Go2Net because we
and  Go2Net  may not be able to sell  significant  amounts  of  advertising  and
premium  Web-based email services to Go2Net's end users.  In the future,  we may
have to issue in-the-money  warrants to acquire our ordinary shares to customers
who  provide us with a large base of  potential  end users.  We may also have to
provide  these  customers  with more  favorable  commercial  terms  than we have
previously provided to our customers.  The issuance of in-the-money warrants and
the  grant  of  more  favorable  terms  to  customers  may  further  dilute  our
shareholders,  increase  our  operating  loss in the  future and cause our stock
price to fall.

We entered  into an email  services  agreement  with  Microsoft  Corporation  in
connection  with  which we  issued a  warrant  to  Microsoft  that  diluted  our
shareholders,  but we may not realize  substantial  revenues  or other  business
benefits from this transaction.

We  entered  into an Email  Services  Agreement  dated  October  26,  1999  with
Microsoft  Corporation.  Under this  agreement,  Commtouch  will, at Microsoft's
option,  customize,  host and maintain email services for Microsoft  websites in
the U.S. and  internationally.  Microsoft  will pay one-time fees for the set-up
and  customization  of the email  service for each website with respect to which
Microsoft chooses to use our services, as well as quarterly service fees for the
email service based on the number of mailboxes hosted. The term of the agreement
shall continue for 12 months after the first commercial distribution date of the
email service and Microsoft may extend the initial term on a quarterly or annual
basis upon 60 days prior  written  notice.  The  agreement  may be terminated by
Microsoft for convenience upon 90 days' prior written notice, or by either party
upon a  material  breach by the other  party  upon the  terms  specified  in the
agreement.  In connection  with the agreement,  Commtouch  issued to Microsoft a
warrant, exercisable until December 29, 1999, to purchase 707,965 of Commtouch's
ordinary  shares  at an  exercise  price of $28.25  per  share for an  aggregate
exercise price of approximately $20.0 million.  On December 29, 1999,  Microsoft
exercised  the  warrant  and now holds  707,965  ordinary  shares.  We agreed to
register these shares with the Commission.  The registration became effective on
January 7, 2000.  However, we may not realize any revenues or any other business
benefits  from this  transaction  because  Microsoft is not obligated to use our
services  with  respect to any website and has not agreed to provide us with any
other business benefits.

                                        5



<PAGE>

We depend on our customer  relationships,  which are based on  relatively  short
term, nonexclusive agreements,  and the loss of one or more customers could harm
our business.

Our  ability to increase  revenues  depends  upon  successful  marketing  of our
services through new and existing  customers.  Our agreements with our customers
generally can be terminated  for any or for no reason after the first year.  The
agreements  with our customers are  non-exclusive  and do not restrict them from
introducing   competing   services.   Also,  some  of  our  relationships  allow
termination  earlier  than one year.  Loss of one or a few key  customers  could
damage our reputation and hurt our ability to develop new  relationships.  If we
fail to develop new relationships or if our customers  terminate or do not renew
their  contracts  with us, our business will suffer,  as we will lose  potential
revenue from the lost customers and from their  underlying  base of email users.
One customer,  Excite,  accounted for 54% of our revenues in 1998. Revenues from
MyPoints,  a permission  based email  service  company,  represented  11% of our
revenues in 1999.  Customers may provide us with a large number of users but pay
a relatively small minimum annual service fee.

We have  many  established  competitors  who are  offering  the same or  similar
services  and we will not be able to compete  effectively  against  them if they
provide superior services at better prices.

The market for Web-based  email services is intensely  competitive and we expect
it to be increasingly competitive. Increased competition could result in pricing
pressures,  reduced  operating  margins and loss of market  share,  any of which
could cause our business to suffer.

In the  market  for email and  messaging  services,  we  compete  directly  with
Web-based  email  service  providers,  including  Critical  Path,  Mail.com  and
USA.NET,  as well as with  companies  that develop and maintain  in-house  email
solutions.  In addition,  companies such as  Software.com  currently offer email
software products to ISPs, web hosting companies,  web portals and corporations.
Furthermore, numerous small-scale email providers offer low-cost basic services,
but  without  scalable  systems or  value-added  functionality.  These and other
companies   could   potentially   leverage  their  existing   capabilities   and
relationships  to enter the email service  industry by redesigning  their system
architecture,  pricing and  marketing  strategies  to sell through to the entire
market.   The  ability  of  these  competitors  to  offer  a  broader  suite  of
complementary  services may give them a  considerable  advantage over us. In the
future,  ISPs, web hosting  companies and outsourced  application  companies may
broaden their service offerings to include outsourced email.

Our market's level of  competition is likely to increase as current  competitors
increase the sophistication of their offerings and as new participants enter the
market.  In the future,  as we expand our service  offerings,  we may  encounter
increased competition in the development and delivery of these services. Many of
our current and potential  competitors have longer operating  histories,  larger
customer bases,  greater brand recognition and greater financial,  marketing and
other  resources  than  we  do  and  may  enter  into  strategic  or  commercial
relationships on more favorable terms.  Further,  certain of our competitors may
offer services at or below cost. In addition, new technologies and the expansion
of existing technologies may increase competitive pressures on us. We may not be
able  to  compete  successfully  against  current  and  future  competitors  and
increased competition may result in reduced operating margins and loss of market
share.

We are  experiencing  rapid internal growth which has and likely will strain our
management resources.

We recently began to expand our  operations  rapidly and intend to continue this
expansion. The number of our employees increased from 45 on December 31, 1998 to
214 on December 31, 1999. This expansion has placed, and is expected to continue
to place,  a significant  strain on our  managerial,  operational  and financial
resources. To manage any further growth, we will also need to improve or replace
our existing operational, customer service and financial systems, procedures and
controls.

                                        6


<PAGE>

The loss of our key employees would  adversely  affect our ability to manage our
business,  therefore  causing our  operating  results to suffer and the value of
your investment to decline.

Our success  depends on the skills,  experience  and  performance  of our senior
management and other key personnel, many of whom have worked together for only a
short period of time.  The loss of the services of any of our senior  management
or other key personnel,  including Gideon Mantel,  our Chief Executive  Officer,
Isabel Maxwell, the President of our United States subsidiary, and Amir Lev, our
President and Chief Technical Officer, could materially and adversely affect our
business. We do not have employment agreements with any of our senior management
or other key  personnel.  We cannot prevent them from leaving at any time. We do
not maintain key-person life insurance policies on any of our employees.

Because our business is based on communications and messaging  services,  we are
susceptible to system interruptions and capacity  constraints,  which could harm
our business and reputation.

Our ability to  successfully  receive and send our end users' email messages and
provide  acceptable  levels of  service  largely  depends on the  efficient  and
uninterrupted  operation of our computer and communications hardware and network
systems and those of our outsourced hosting service. In addition,  the growth in
the  use of the  Internet  has  caused  frequent  interruptions  and  delays  in
accessing  the  Internet  and  transmitting  data over the  Internet.  We do not
possess  insurance to cover losses caused by unplanned system  interruptions and
software  defects.  In the past, we have experienced  some  interruptions in our
email service.  We believe that these  interruptions will continue to occur from
time to time. These  interruptions may be due to hardware failures,  unsolicited
bulk  email  (also  known as  "spam"),  operating  system  failures,  inadequate
Internet  infrastructure  capacity,  and other  mechanical and human causes.  We
expect to experience  occasional,  temporary capacity constraints due to sharply
increased traffic,  which may cause  unanticipated  system  disruptions,  slower
response times,  impaired quality and degradation in levels of customer service.
If we experience  frequent or long system  interruptions that reduce our ability
to provide email  services,  we may have fewer users of our email  services.  In
addition,  we have entered into service  agreements  with some of our  customers
that require minimum performance standards.  If we fail to meet these standards,
our customers could terminate their relationships with us.

We must  continue  to expand and adapt our  network  infrastructure  to changing
requirements  and increasing  numbers of end users. The expansion and adaptation
of our network  infrastructure will require substantial  financial,  operational
and managerial  resources.  In addition, we depend on improvements being made to
the entire Internet  infrastructure  to alleviate  overloading and congestion of
the  Internet.  The  ability of our network to continue to connect and manage an
expanding  number of  customers,  end users and  messages  at high  transmission
speeds is unproven and uncertain. We face risks related to our network's and the
Internet's ability to operate with higher use levels while maintaining  expected
performance levels.

We are a relatively small competitor in the electronic  messaging  industry and,
as  a  result,  we  may  not  have  the  resources  to  adapt  to  the  changing
technological   requirements  and  the  shifting  consumer  preferences  of  our
industry.

The Internet messaging industry is characterized by rapid technological  change,
changes in end user  requirements  and  preferences,  and the  emergence  of new
industry  standards  and practices  that could render our existing  services and
proprietary technology obsolete. Our success depends, in part, on our ability to
continually enhance our existing email and messaging services and to develop new
services,  functions and technology that address the increasingly  sophisticated
and varied needs of our  prospective  customers.  The development of proprietary
technology and necessary service enhancements entails significant  technical and
business risks and requires substantial  expenditures and lead-time.  We may not
be able to keep pace with the latest technological  developments.  We may not be
able to use new  technologies  effectively  or adapt our services to customer or
end user  requirements  or emerging  industry  standards.  Also,  in addition to
addressing  changing  technologies  and end user needs,  we must also do so more
quickly than our competition.

                                        7



<PAGE>

Our services may be adversely  affected by software  defects,  which could cause
our  customers or end users to stop using our  services.

Our  service  offerings  depend on  complex  software.  Complex  software  often
contains  defects,  particularly  when first introduced or when new versions are
released.  Although we conduct extensive  testing,  we may not discover software
defects that affect our new or current services or enhancements until after they
are deployed.  Although we have not experienced any material software defects to
date,  it is  possible  that,  despite  testing by us,  defects may exist in the
software we use.  These  defects could cause  service  interruptions  that could
damage our reputation or increase our service  costs,  cause us to lose revenue,
delay market acceptance or divert our development resources,  any of which could
cause our  business  to  suffer.  Some of our  services  are  based on  software
provided by third parties. We have no control over the quality of such software.

We rely on the integrity of our network  security,  which may be  susceptible to
breaches that could harm our reputation and business.

A fundamental  requirement for online  communications is the secure transmission
of confidential  information over public networks.  Third parties may attempt to
breach our  security or that of our  customers.  Despite our  implementation  of
third party encryption technology and network security measures, our servers are
vulnerable to computer  viruses,  physical or  electronic  break-ins and similar
disruptions,  which could lead to interruptions,  delays or loss of data. We may
be liable to our  customers  and their end users for any breach in our security,
including  claims for  impersonation  or other similar fraud claims,  as well as
claims for other misuses of personal  information,  for example for unauthorized
marketing  purposes.   Also,  such  a  breach  could  harm  our  reputation  and
consequently our business. We may also be required to expend significant capital
and other resources to license encryption technology and additional technologies
to protect  against  security  breaches or to alleviate  problems  caused by any
breach.  Our failure to prevent security  breaches could have a material adverse
effect on our business and operating results.

In  addition,  the  Federal  Trade  Commission  and  several  states  have  been
investigating   some  Internet   companies   regarding  their  use  of  personal
information. We could incur additional expenses if new regulations regarding the
use of  personal  information  are  introduced,  if our  privacy  practices  are
investigated  or if our  privacy  policies  are viewed  unfavorably  by users or
potential users.

If we fail to  adequately  protect our  intellectual  property  rights or face a
claim of intellectual  property infringement by a third party, we could lose our
intellectual property rights or be liable for significant damages.

We regard our copyrights,  service marks, trademarks,  trade secrets and similar
intellectual  property as critical to our  success,  and rely on  trademark  and
copyright law, trade secret protection and confidentiality or license agreements
with our  employees  and  customers  to protect our  proprietary  rights.  Third
parties may infringe or  misappropriate  our copyrights,  trademarks and similar
proprietary rights.  Although we have not filed any patent applications,  we may
seek to patent  certain  software or other  technology  in the future.  Any such
future  patent  applications  may not be issued  with the scope of the claims we
seek, or at all. We cannot be certain that our software does not infringe issued
patents that may relate to our software  products.  In addition,  because patent
applications in the United States are not publicly disclosed until the patent is
issued, applications may have been filed which relate to our software products.

Despite our precautions, unauthorized third parties may copy certain portions of
our technology or reverse  engineer or obtain and use information that we regard
as proprietary. End user license provisions protecting against unauthorized use,
copying,  transfer and disclosure of the licensed  program may be  unenforceable
under the laws of some  jurisdictions and foreign  countries.  In addition,  the
laws of some  foreign  countries do not protect  proprietary  rights to the same
extent  as do the  laws of the  United  States.  Our  means  of  protecting  our
proprietary  rights  in the  United  States or abroad  may not be  adequate  and
competitors may independently develop similar technology.

Our ZapZone Network  service allows  webmasters to select the email service name
of their choice  (although we reserve the right to eliminate their account or to
change their email service name).

                                        8



<PAGE>

There is,  therefore,  the possibility that they will select email service names
that may  infringe the rights of others.  We have  received  several  complaints
about ZapZone Network service webmasters'  registered email service names and we
have  referred  these  complainants  directly  to the  ZapZone  Network  service
subscribers who are allegedly  engaging in the infringing  activities.  However,
these  complainants  may seek to enforce their rights against us in addition to,
or instead of, the infringing webmasters.

We may have  liability for email content and we may not have adequate  liability
insurance.

As a provider of email  services,  we face potential  liability for  defamation,
negligence,  copyright,  patent or trademark infringement and other claims based
on the nature and content of the materials  transmitted via email. We do not and
cannot screen all of the content generated by end users, and we could be exposed
to liability with respect to this content. Some foreign governments, such as the
government of Germany,  have enforced  laws and  regulations  related to content
distributed over the Internet that are more strict than those currently in place
in the United  States.  Although  we carry  general and  professional  liability
insurance  coverage,  our  insurance  may not  adequately  protect  us from such
claims. Any imposition of liability,  particularly liability that is not covered
by insurance, or is in excess of insurance coverage, could damage our reputation
and hurt our  business  and  operating  results,  or could  result  in  criminal
penalties.

Governmental  regulation and legal  uncertainties could impair the growth of the
Internet  and  decrease  demand for our  services or increase  our cost of doing
business.

There are currently few laws and regulations directly applicable to the Internet
and  commercial  email  services.  However,  a number of laws have been proposed
involving  the  Internet,  including  laws  addressing  user  privacy,  pricing,
content, copyright,  antitrust,  distribution and characteristics and quality of
products and services.  Further,  the growth and  development  of the market for
email may prompt  calls for more  stringent  consumer  protection  laws that may
impose additional burdens on companies conducting business online. Moreover, the
applicability  to  the  Internet  of  existing  laws  in  various  jurisdictions
governing issues such as property  ownership,  sales and other taxes,  libel and
personal  privacy is  uncertain  and may take years to resolve.  The adoption of
additional  laws  or  regulations,  or  the  application  of  existing  laws  or
regulations to the Internet, may impair the growth of the Internet or commercial
online  services.  This could  decrease the demand for our services and increase
our  cost of doing  business,  or  otherwise  harm our  business  and  operating
results.

Due to  the  global  nature  of the  Web,  it is  possible  that,  although  our
transmissions currently originate in California, the governments of other states
or foreign  countries might attempt to regulate our  transmissions or levy sales
or other taxes relating to our activities. The European Union recently adopted a
directive  addressing  data privacy that may result in limits on the  collection
and use of user information.

On October 20,  1999,  The  Federal  Trade  Commission  issued the final rule to
implement the Children's  Online Privacy  Protection Act of 1998 ("COPPA").  The
main goal of the COPPA and the rule is to protect the privacy of children  using
the  Internet.  As of April 21,  2000,  certain  commercial  websites and online
services directed to, or that knowingly collect  information from, children must
obtain  parental  consent  before  collecting,  using,  or  disclosing  personal
information  from  children  under 13. The COPPA  regulations  could  reduce our
ability to engage in direct marketing. The cost to the Company of complying with
the new  requirements is not known and such cost may have a material effect upon
operating results or financial condition.

We may need  additional  capital  and  raising  additional  capital  may  dilute
existing shareholders.

We believe that our existing  capital  resources  will enable us to maintain our
current and planned operations for at least the next 12 months.  However, we may
be required to raise  additional funds due to unforeseen  circumstances.  If our
capital  requirements  vary  materially  from those  currently  planned,  we may
require additional financing sooner than anticipated.  Such financing may not be
available in

                                        9



<PAGE>

sufficient  amounts  or on terms  acceptable  to us and may  cause  dilution  to
existing  shareholders.  Also, we may raise additional  capital in the future by
issuing  securities  that have superior  rights and  preferences to our ordinary
shares.

Purchasers of our ordinary shares may suffer immediate and substantial dilution.

The offering price of the shares may be substantially higher than the book value
per share of our  ordinary  shares.  Some  elements  of our market  value do not
originate from measurable transactions.  Therefore, there is not a corresponding
rise in  "book," or  historical  cost  accounting,  value for our rise in market
value, if any. Examples of these elements include the perceived growth prospects
of our core commercial market, perceived growth prospects of our Web-based email
services and our perceived  competitive position within the market for Web-based
email services. Purchasers of the ordinary shares or the warrant will experience
immediate  dilution  to the  extent the  purchase  price of the  shares,  or the
exercise  price of the warrant,  is lower than the pro forma net  tangible  book
value per share of ordinary  shares.  Purchasers may also experience  additional
dilution upon the exercise of outstanding stock options and warrants to purchase
our ordinary shares.

Our directors,  executive  officers and principal  shareholders  will be able to
exert  significant  influence over matters  requiring  shareholder  approval and
could delay or prevent a change of control.

Our directors and  affiliates of our directors,  our executive  officers and our
shareholders  who  currently  own  over  five  percent  of our  ordinary  shares
beneficially  own  approximately   30%  of  our  outstanding   ordinary  shares.
Immediately  following  the  offering,  they will own  approximately  20% of our
outstanding  ordinary  shares  (whether or not the  underwriters'  overallotment
option is exercised in full). If they vote together,  these shareholders will be
able to exercise  significant  influence over all matters requiring  shareholder
approval,  including  the  election of  directors  and  approval of  significant
corporate  transactions.  This  concentration  of ownership  could also delay or
prevent a change in control of Commtouch.

Go2Net and Vulcan Ventures beneficially own approximately 15% of our outstanding
ordinary  shares  (assuming  exercise  of the Go2Net  warrant on a net  exercise
basis).  Vulcan  Ventures is a significant  shareholder of Go2Net.  Accordingly,
Go2Net and Vulcan Ventures will be able to significantly  influence and possibly
exercise  control  over most  matters  requiring  approval by our  shareholders,
including  the  election of  directors  and  approval of  significant  corporate
transactions.  This  concentration  of  ownership  may also  have the  effect of
delaying  or  preventing  a change in  control.  Go2Net and Vulcan also have the
right to name one  director  to our  Board as long as they  continue  to hold at
least 620,022 shares,  including the shares issuable upon exercise of the Go2Net
warrant.  They have named  Thomas  Camp to the Board  under this  provision.  In
addition,  conflicts of interest may arise as a consequence of Go2Net's  control
relationship with us, including:

    * conflicts between Go2Net and Vulcan Ventures, as significant shareholders,
      and our other  shareholders,  whose  interests may differ with respect to,
      among other  things,  our  strategic  direction or  significant  corporate
      transactions;

    * conflicts related to corporate  opportunities that could be pursued by us,
      on the one hand, or by Go2Net, on the other hand; or

    * conflicts related to existing or new contractual relationships between us,
      on the one hand, and Go2Net and its other affiliates, on the other hand.


                                       10

<PAGE>

Our  business  and  operating  results  could  suffer if we do not  successfully
address the risks inherent in the expansion of our international  operations.

At present,  we have sales offices in the United States,  Israel and England. We
intend to continue to expand into international markets and to spend significant
financial  and  managerial  resources  to do so. We have limited  experience  in
international  operations  and  may  not  be  able  to  compete  effectively  in
international  markets.  The  Company  will face risks  inherent  in  conducting
business internationally, such as:

    * difficulties and costs of staffing and managing international operations;

    * fluctuations in currency exchange rates;

    * imposition of currency exchange controls;

    * differing technology standards;

    * export  restrictions,  including  export  controls  relating to encryption
      technologies;

    * difficulties  in  collecting  accounts  receivable  and longer  collection
      periods;

    * unexpected changes in regulatory requirements;

    * political and economic instability;

    * potentially adverse tax consequences; and

    * potentially reduced protection for intellectual property rights.

Any  of  these  factors  could  adversely  affect  the  Company's  international
operations  and,  consequently,  business and operating  results.  Specifically,
failure to  successfully  manage  international  growth  could  result in higher
operating  costs than  anticipated  or could  delay or preclude  altogether  the
Company's ability to generate revenues in key international markets.

Substantial sales of our ordinary shares could adversely affect our stock price.

The sale, or  availability  for sale, of substantial  quantities of our ordinary
shares  may have the  effect  of  depressing  its  market  price by  potentially
introducing  a large  number of sellers  into the market.  A large number of our
ordinary  shares are  currently  eligible for resale.  In addition a significant
number of shares will be eligible for resale at various dates in the  future.See
"Shares Eligible for Future Sale."


Risks Relating to Operations in Israel

We have  important  facilities  and  resources  located  in  Israel,  which  has
historically  experienced severe economic instability and military and political
unrest.

We are  incorporated  under  the laws of the  State  of  Israel.  Our  principal
research   and   development   facilities   are  located  in  Israel.   Although
substantially  all of our sales  currently  are being made to customers  outside
Israel, we are nonetheless  directly  influenced by the political,  economic and
military conditions affecting Israel. Any major hostilities involving Israel, or
the  interruption or curtailment of trade between Israel and its present trading
partners, could significantly harm our business, operating results and financial
condition.

Israel's economy has been subject to numerous destabilizing factors, including a
period of rampant  inflation in the early to  mid-1980's,  low foreign  exchange
reserves,  fluctuations in world commodity prices,  military conflicts and civil
unrest.  In addition,  Israel and companies doing business with Israel have been
the  subject  of an  economic  boycott  by the  Arab  countries  since  Israel's
establishment. These restrictive laws and policies may have an adverse impact on
our operating results, financial condition or expansion of our business.

Since the establishment of the State of Israel in 1948, a state of hostility has
existed, varying in degree and intensity, between Israel and the Arab countries.
Although Israel has entered into various  agreements with certain Arab countries
and the  Palestinian  Authority,  and various  declarations  have been signed in
connection  with efforts to resolve some of the economic and political  problems
in the Middle East, we cannot  predict  whether or in what manner these problems
will be resolved.

                                       11

<PAGE>

Our results of operations  may be negatively  affected by the  obligation of key
personnel to perform military service.

In addition,  certain of our officers and employees  are currently  obligated to
perform  annual  reserve  duty in the Israel  Defense  Forces and are subject to
being  called for  active  military  duty at any time.  Although  Commtouch  has
operated  effectively under these  requirements  since its inception,  we cannot
predict  the  effect  of these  obligations  on  Commtouch  in the  future.  Our
operations could be disrupted by the absence for a significant  period of one or
more of our officers or key employees due to military service.

Because a  substantial  portion of our revenues are  generated in U.S.  dollars,
while a significant portion of our expenses are incurred in New Israeli Shekels,
our results of  operations  may be adversely  affected by inflation and currency
fluctuations.

We generate a  substantial  portion of our revenues in U.S.  dollars but incur a
significant portion of our expenses,  principally salaries and related personnel
expenses,  in New Israeli Shekels,  commonly referred to as NIS. As a result, we
are  exposed to the risk that the rate of  inflation  in Israel  will exceed the
rate of  devaluation  of the NIS in relation to the dollar or that the timing of
any  devaluation may lag behind  inflation in Israel.  While in recent years the
rate of  devaluation  of the NIS  against  the dollar has  exceeded  the rate of
inflation,  which is a reversal  from prior  years,  we cannot be sure that this
reversal  will  continue.  If the  dollar  cost  of  our  operations  in  Israel
increases, our dollar-measured results of operations will be adversely affected.
Our  operations  also  could be  adversely  affected  if we are  unable to guard
against  currency  fluctuations  in the future.  Accordingly,  we may enter into
currency  hedging  transactions to decrease the risk of financial  exposure from
fluctuations in the exchange rate of the dollar against the NIS. These measures,
however,  may not adequately protect us from material adverse effects due to the
impact of inflation in Israel.

Israeli  courts might not enforce  judgments  rendered  outside of Israel and it
might therefore be difficult for an investor to recover any judgment against any
of our officers or directors resident in Israel.

We  are  organized  under  the  laws  of  Israel,  and we  maintain  significant
operations  in  Israel.  Certain of our  officers  and  directors  named in this
prospectus reside outside of the United States. Therefore, you might not be able
to enforce any judgment  obtained in the U.S. against us or any of such persons.
You might not be able to bring civil actions under U.S.  securities  laws if you
file a lawsuit in Israel.  However,  we have been advised by our Israeli counsel
that,  subject  to  certain  limitations,  Israeli  courts  may  enforce a final
judgment of a U.S. court for liquidated amounts in civil matters after a hearing
in Israel. We have appointed Commtouch Inc., our U.S.  subsidiary,  as our agent
to receive  service of  process  in any  action  against us arising  out of this
offering.  We have not given our  consent  for our  agent to accept  service  of
process in connection with any other claim and it may therefore be difficult for
an  investor  to effect  service  of process  against us or any of our  non-U.S.
officers,  directors  and  experts  relating to any other  claims.  If a foreign
judgment  is  enforced  by an  Israeli  court,  it will be  payable  in  Israeli
currency.

Provisions of Israeli law may delay, prevent or make difficult an acquisition of
Commtouch,  which could  prevent a change of control and  therefore  depress the
price of our stock.

Israeli corporate law regulates  mergers,  votes required to approve mergers and
acquisitions  of shares through tender offers,  requires  special  approvals for
transactions involving significant shareholders and regulates other matters that
may be  relevant  to  these  types  of  transactions.  Furthermore,  Israel  tax
considerations may make potential  transactions  unappealing to us or to some of
our shareholders.

The new Israeli Companies Law imposes substantial duties on shareholders and may
cause uncertainties  regarding corporate  governance.  The new Israeli Companies
Law, which became  effective on February 1, 2000, has brought about  significant
changes to Israeli  corporate  law.  The new law  includes  provisions  imposing
substantial

                                       12

<PAGE>


duties on certain  controlling and  non-controlling  shareholders.  In addition,
there may be uncertainties  regarding corporate  governance in some areas. These
uncertainties  will persist until this new law has been adequately  interpreted,
and these  uncertainties  could inhibit takeover attempts or other  transactions
and inhibit other corporate decisions.


                                 USE OF PROCEEDS


We will not receive any  proceeds  from the sale of the shares or the warrant by
the Selling Securityholders in this offering.


                                       13




<PAGE>

                             SELLING SECURITYHOLDERS

The following table presents information provided by the Selling Securityholders
with respect to beneficial  ownership of our ordinary shares as of May 31, 2000,
and as adjusted to reflect the sale of the shares offered by this prospectus, by
the Selling Securityholders.

The table includes all shares  issuable  within 60 days of May 31, 2000 upon the
exercise  of  options,  warrants  and  other  rights  beneficially  owned by the
indicated  shareholders  on that date.  Beneficial  ownership is  determined  in
accordance with the rules of the Securities and Exchange Commission and includes
voting and investment  power with respect to shares.  To our  knowledge,  except
under applicable community property laws or as otherwise indicated,  the persons
named in the table have sole voting and sole investment  control with respect to
all shares beneficially  owned. The applicable  percentage of ownership for each
shareholder  is based on 16,415,069  ordinary  shares  outstanding as of May 31,
2000  (assuming  in each case the issuance of 368,270  ordinary  shares upon the
assumed  net  exercise  at an  assumed  share  price of $18.94  per share of the
in-the-money  warrant to purchase  1,136,000 ordinary shares issued to Go2Net at
an  exercise  price of $12.80 per share and  assuming  the  issuance  of 397,580
ordinary shares issuable upon exercise of options granted to executive  officers
and  directors  within 60 days of May 31,  2000 at a weighted  average  exercise
price  of  $24.20  per  share.)  and  16,415,069   ordinary  shares  outstanding
immediately following the completion of this offering,  together with applicable
options and/or warrants for that shareholder.

<TABLE>
<CAPTION>

                                             Shares Beneficially                   Shares Beneficially
                                           Owned Prior to Offering     Shares      Owned After Offering
                                           -----------------------      Being      --------------------
         Name of Beneficial Owner             Number      Percent      Offered      Number     Percent
------------------------------------------ -----------   ---------   -----------   --------   --------
<S>                                         <C>              <C>      <C>             <C>        <C>
Go2Net, Inc.(1) ..........................  2,032,057        12.4     2,032,057       0          0
 999 3rd Avenue, Suite 4700
 Seattle, WA 98104
Vulcan Ventures, Incorporated(2) .........    448,029         2.7       448,029       0          0
 110 110th Avenue N.E., Suite 550
 Bellevue, WA 98004
Microsoft Corporation(3) .................    707,965         4.3       707,965       0          0
 One Microsoft Way
 Redmond, WA 98052
<FN>
------------
(1) Includes 869,057 ordinary shares held directly and 1,136,000 ordinary shares
    available  upon exercise of a warrant.  See "RISK  FACTORS" for  information
    regarding the transaction in which the ordinary shares were issued.
(2) Shares were purchased in a private placement.
(3) Shares were  purchased on December 29, 1999 upon exercise of a warrant.  See
    "RISK  FACTORS"  for  information  regarding  the  transaction  in which the
    ordinary shares were issued.
</FN>
</TABLE>

                                       14

<PAGE>

                          DESCRIPTION OF SHARE CAPITAL

Description of Shares

Set forth  below is a summary of the  material  provisions  governing  our share
capital.  This  summary is not  complete  and should be read  together  with our
Memorandum of Association and Articles of Association, copies of which have been
filed as exhibits to the Registration Statement of which this prospectus forms a
part subject to amendment of our Articles of Association from time to time.

As of May 31,  2000,  our  authorized  share  capital  consisted  of  40,000,000
ordinary  shares,  NIS 0.05 par value. As of May 31, 2000, there were 16,415,069
ordinary  shares  (assuming  the net  exercise  of the  Go2Net  warrant  and the
exercise of directors' and executive  officers'  stock options) and no preferred
shares issued and outstanding.

Description of Ordinary Shares

All issued and  outstanding  ordinary  shares of Commtouch are, and the ordinary
shares offered upon exercise of the Go2Net warrant when issued and paid for will
be,  duly  authorized  and validly  issued,  fully paid and  nonassessable.  The
ordinary  shares  do not have  preemptive  rights.  Neither  our  Memorandum  of
Association,  Articles  of  Association  nor the  laws of the  State  of  Israel
restrict in any way the ownership or voting of ordinary shares by  non-residents
of Israel,  except with respect to subjects of countries which are in a state of
war with Israel.

Dividend and Liquidation Rights

The  ordinary  shares  offered by this  prospectus  are  entitled  to their full
proportion  of any  cash  or  share  dividend  declared  from  the  date of this
prospectus.

Subject  to the  rights of the  holders  of shares  with  preferential  or other
special  rights  that may be  authorized,  the  holders of  ordinary  shares are
entitled to receive  dividends in  proportion to the sums paid up or credited as
paid up on account of the  nominal  value of their  respective  holdings  of the
shares in  respect of which the  dividend  is being paid  (without  taking  into
account the  premium  paid up on the  shares)  out of assets  legally  available
therefor  and, in the event of our  winding  up, to share  ratably in all assets
remaining  after  payment of  liabilities  in proportion to the nominal value of
their respective holdings of the shares in respect of which such distribution is
being  made,  subject to  applicable  law.  Our Board of  Directors  may declare
interim  dividends and recommend a final annual dividend only out of profits and
in such  amounts as the Board of Directors  may  determine.  Declaration  of the
final annual dividend requires shareholder approval at a general meeting,  which
may reduce but not increase  such dividend  from the amount  recommended  by the
Board of Directors.

In case of a share  dividend,  holders of shares can  receive  shares of a class
whether such class existed  prior  thereto or was created  therefor or shares of
the same  class  that  conferred  upon the  holders  the right to  receive  such
dividend.

Voting, Shareholder Meetings and Resolutions

Holders of  ordinary  shares have one vote for each  ordinary  share held on all
matters submitted to a vote of shareholders.  Such rights may be affected by the
future  grant of any special  voting  rights to the holders of a class of shares
with  preferential  rights.  Any change in the registered  capital of Commtouch,
including the creation of a new class of shares with rights superior or inferior
to  existing  classes of shares may be  adopted by a "special  resolution"  (the
resolution of the holders of 75 percent or more of the shares participating in a
general meeting).  Once the creation of a class of shares with preference rights
has been approved, the Board of Directors may issue preferred shares, unless the
Board is limited from doing so by the Articles of  Association  or a contractual
provision.

An annual  general  meeting must be held once every  calendar  year at such time
(not more than 15 months after the last preceding annual general meeting) and at
such place,  either within or outside the State of Israel,  as may be determined
by the  Board of  Directors.  The  quorum  required  for a  general  meeting  of
shareholders consists of at least two shareholders present in person or by proxy
and holding,  or  representing,  more than one-third of the voting rights of the
issued share capital. A

                                       15

<PAGE>

meeting  adjourned  for lack of a quorum may be adjourned to the same day in the
next week at the same time and place,  or to such time and place as the Chairman
may  determine  with the  consent of the  holders  of a  majority  of the shares
present in person or by proxy and voting on the question of adjournment. At such
reconvened  meeting any two shareholders  present in person or by proxy (and not
in default under the articles) will constitute a quorum.


Most  shareholder  resolutions,   including  resolutions  for  the  election  of
directors,  the  declaration  of dividends,  the  appointment of auditors or the
approval of  transactions  with Office Holders as required by the Companies Law,
will be deemed  adopted if  approved  by the holders of a majority of the voting
power  represented at the meeting,  in person or by proxy,  and voting  thereon.
According to the Company's  Articles of Association,  certain  corporate actions
such as  making  changes  in the  capital  structure  of  Commtouch  (such  as a
reduction of capital,  increase of capital or share split) and authorizing a new
class of shares or changing special rights of a class of shares must be approved
by a "special  resolution"  and will be deemed  adopted  only if approved by the
holders of not less than 75 percent of the voting power represented in person or
by proxy at the meeting and voting thereon,  and in some cases 75 percent of the
voting power of the affected class of shares.

Anti-Takeover Provisions Under Israeli Law

Under the  Companies  Law, a merger is generally  required to be approved by the
shareholders  and board of  directors of each of the merging  companies.  If the
share capital of the company that will not be the  surviving  company is divided
into different  classes of shares,  the approval of each class is also required.
The Companies Law provides that the articles of association  of companies,  such
as ours, that were incorporated  prior to February 1, 2000 are deemed to include
a  provision  whereby  the  approval  of a merger  requires a majority  of three
quarters of those present and voting at a general  meeting of  shareholders.  In
addition, a merger can be completed only after all approvals have been submitted
to the Israeli Registrar of Companies and at least seventy days have passed from
the  time  that a  proposal  for  approval  of the  merger  was  filed  with the
Registrar.

The  Companies Law provides that an  acquisition  of shares in a public  company
must be made by means of a tender  offer if as a result of the  acquisition  the
purchaser  would become a 25%  shareholder  of the  company.  This rule does not
apply if there is already another 25% shareholder of the company. Similarly, the
Companies Law provides that an acquisition of shares in a public company must be
made by means of tender offer if as a result of the  acquisition  the  purchaser
would become a 45% shareholder of the company, unless someone else already holds
a majority of the voting power of the  company.  These rules do not apply if the
acquisition  is made  by way of a  merger.  Regulations  promulgated  under  the
Companies  Law provide  that these  tender  offer  requirements  do not apply to
companies whose shares are listed for trading outside of Israel if, according to
the law in the country in which the shares are traded,  including  the rules and
regulations of the stock exchange on which the shares are traded, either:

    * there  is a  limitation  on  acquistion  of any  level of  control  of the
      company; or

    * the acquisition of any level of control requires the purchaser to do so by
      means of a tender offer to the public.

                                       16

<PAGE>

Finally,   Israeli   tax  law  treats   specified   acquisitions,   including  a
stock-for-stock  swap  between an Israeli  company and a foreign  company,  less
favorably  than does U.S. tax law.  For  example,  Israeli tax law may subject a
shareholder   who  exchanges  his  ordinary  shares  for  shares  in  a  foreign
corporation to immediate taxation.

Transfer of Shares and Notices

Fully paid ordinary  shares are issued in registered form and may be transferred
freely.  Each  shareholder of record is entitled to receive at least seven days'
prior notice of shareholder  meetings.  A special resolution can be adopted only
if  shareholders  are given 21 days'  prior  notice of the meeting at which such
resolution will be voted on (unless all shareholders entitled to vote agree that
the meeting may be held on a shorter notice period). For purposes of determining
the  shareholders  entitled to notice and to vote at such meeting,  the Board of
Directors may fix the record date not exceeding 90 days prior to the date of any
general meeting.

Modification of Class Rights

If at any time the share  capital is divided into  different  classes of shares,
the rights attached to any class (unless  otherwise  provided by our Articles of
Association)  may be modified or abrogated by Commtouch by a special  resolution
subject to the  consent in  writing of the  holders of the issued  shares of the
class, or by the adoption of a special  resolution  passed at a separate general
meeting of the holders of the shares of such class.

Description of Warrant Offered in This Prospectus

In connection with the Customized Web-based Email Service Agreement entered into
between  Commtouch's  U.S.  subsidiary and Go2Net,  Commtouch issued to Go2Net a
fully vested, non-foreitable, warrant to purchase 1,136,000 ordinary shares at a
per-share  exercise  price of $12.80,  subject to  adjustment as provided in the
warrant.  The  warrant is  exercisable  at any time until it expires on July 16,
2004.  At Go2Net's  option,  the warrant is  exercisable  pursuant to a cashless
exercise based on the average  closing price of the ordinary shares for the five
days preceding the exercise.  The Company extended registration rights to Go2Net
covering the warrant and the shares issuable upon exercise of the warrant.

General

Prior to this  offering,  there has been no public market for the warrant and no
such market is likely to develop upon  completion of the offering.  The terms of
the warrant were  negotiated  between the Company and Go2Net.  The sale price of
the warrant in this offering will be determined  solely by Go2Net in negotiation
with any prospective purchaser.  The terms of the warrant are not related to the
Company's  asset value,  earnings,  book value or other such  criteria of value.
Further,  the terms upon  which the  Company  will be able to obtain  additional
equity capital may be adversely  affected since the holder of the warrant can be
expected to exercise it at a time when the Company would, in all likelihood,  be
able to obtain any needed  capital on terms more  favorable  to the Company than
those provided in the warrant.

Go2Net  and its  transferee(s)  may be  deemed  to be  "underwriters"  under the
Securities  Act with respect to the sale of the shares and the warrant,  and any
profit  realized  upon the sale of the  shares  and  warrant  may  deemed  to be
additional underwriting compensation.

Antidilution Provisions

The holder of the warrant is given the  opportunity to profit from a rise in the
market  price of the  ordinary  shares and the  warrant.  To the extent that the
warrant is exercised,  dilution of the  interests of the Company's  shareholders
will occur.  In  addition,  the warrant  includes  provisions  which  adjust the
exercise and price upon the occurence of certain events.

The  warrant  provides  that  Go2Net or its  permitted  assigns,  is entitled to
purchase up to 1,136,000  fully paid and  nonassessable  ordinary  shares at the
price of $12.80 per share. The warrant is exercisable, in

                                       17

<PAGE>

whole or in part,  at any time and from time to time on and after July 16,  1999
through July 16, 2004 upon presentation and surrender at the principal office of
the Company and payment of the exercise price.

The warrant has a net exercise  feature  under which the  exercise  price may be
paid by authorizing the Company to withhold the number of shares being exercised
whose fair market value equals the  aggregate  exercise  price of the portion of
the warrant being  exercised.  The net exercise  feature is available as long as
the  ordinary  shares  remain  publicly  traded  or in the  event of a merger or
consolidation  of the Company with or into an  unaffiliated  entity in which the
shareholders  of the Company own less than 50% of the voting  securities  of the
survivor,  or the sale,  transfer  or lease  (except  for a transfer or lease by
pledge or  mortgage  to bona fide  lender)  of all or  substantially  all of the
assets of the Company to an unaffiliated entity.

"Fair  market  value"  means,  (i) if the shares are listed on a national  stock
exchange or the Nasdaq  National  Market,  the average of the closing prices for
the five trading days immediately prior to the date of determination, or (ii) if
the shares are not so listed, the average of the closing bid and asked prices in
the over-the-counter  market for the five trading day's immediately prior to the
date of the  determination,  as furnished by a national quotation service or the
principal  broker making a market in the shares.  In a merger or  consolidation,
fair market value means the merger  consideration  or other value to be received
by the Company's shareholders.

The  holder of the  warrant  is  required  to avoid  becoming  a 10% or  greater
shareholder  of the  Company as a result of any  exercise  of the  warrant.  The
holder is also required to cooperate with the Company so as to minimize  adverse
Israeli tax consequences.

Both the number of shares issuable upon exercise of the warrant and the exercise
price will be ratably  adjusted if any of the following  events occur before the
warrant is exercised:

    * the Company  issues  additional  ordinary  shares or any rights,  options,
      warrants or other securities exercisable for or convertible into shares at
      a total  consideration  per share of less than the warrant  exercise price
      per share.  Options granted to employees and others under  compensatory or
      stock option plans would not trigger such adjustments.

    * the Company  combines all of the outstanding  shares into a smaller number
      of  shares,  in which  case the  exercise  price  will be  proportionately
      increased  and  the  number  of  shares  subject  to the  warrant  will be
      proportionately decreased.

    * the Company declares a dividend or other distribution payable in shares or
      subdivides  its shares into a greater  number,  in which case the exercise
      price  will be  proportionately  decreased.  The number and kind of shares
      available on exercise will be adjusted so that the holder will be entitled
      to receive the same amount and kind of  dividend or  distribution  had the
      holder been a record  holder of shares on any record date with  respect to
      such dividend or distribution, and on the same terms on which the dividend
      or distribution was made. If the distribution  involves rights,  warrants,
      options, or any other convertible  security and the exercise or conversion
      rights  would  expire  prior to  exercise  of the  warrant,  the holder is
      entitled to exercise such rights for 30 days after exercising the warrant.

    * In the event of a merger,  a  reorganization  or  reclassification  of the
      Company's  capital  stock or sale of  substantially  all of the  Company's
      assets, the holder will be entitled to the same consideration  which he or
      she would have  received  if the  warrant  had been  exercised  and shares
      issued prior to such event.

The Company agreed to file a registration  statement with respect to the warrant
and the shares offered under this  prospectus as soon as  practicable  and in no
event later than February 1, 2000. This registration statement is filed pursuant
to that agreement and initially became effective on January 7, 2000.

Holders of the  warrant  are not  entitled  to vote or receive  dividends  or be
deemed the holder of ordinary  shares or have any other rights of a  shareholder
of the Company  until the warrant has been  exercised  and the shares shall have
become  deliverable  to the holder.  Transferee(s)  of the warrant  also will be
subject  to the same  terms of the  warrant  as if such  transferee(s)  were the
original holder.

                                       18


<PAGE>

Description of Other Warrants

Commtouch, Commtouch's U.S. subsidiary and Microsoft Corporation entered into an
Email  Services   Agreement  dated  October  26,  1999.  Under  this  agreement,
Commtouch,  Commtouch's U.S. subsidiary will, at Microsoft's option,  customize,
host and  maintain  email  services  for  Microsoft  websites  in the  U.S.  and
internationally.   Microsoft   will  pay  one-time   fees  for  the  set-up  and
customization  of the email  service  for each  website  with  respect  to which
Microsoft chooses to use our services, as well as quarterly service fees for the
email service based on the number of mailboxes hosted. The term of the agreement
shall continue for 12 months after the first commercial distribution date of the
email service and Microsoft may extend the initial term on a quarterly or annual
basis upon 60 days prior  written  notice.  The  agreement  may be terminated by
Microsoft for convenience upon 90 days' prior written notice, or by either party
upon a  material  breach by the other  party  upon the  terms  specified  in the
agreement.  In connection  with the  agreement,  Commtouch  granted  Microsoft a
warrant, exercisable until December 29, 1999, to purchase 707,965 of Commtouch's
ordinary  shares  at an  exercise  price of $28.25  per  share for an  aggregate
exercise price of $20.0 million.  On December 29, 1999,  Microsoft exercised the
warrant and now holds 707,965 ordinary shares.  We agreed to register the resale
of these shares with the Commission.  The registration  statement, of which this
prospectus is a part, initially became effective on January 7, 2000.

As of December 31, 1999,  Commtouch had  outstanding a warrant to purchase 4,860
ordinary  shares  issued to a consultant.  This warrant was net  exercised  into
4,461 ordinary shares in January 2000.

Registration Rights

The holders of convertible  preferred shares which were converted into 7,109,800
ordinary shares (the "Registrable Securities") upon effectiveness of the initial
public offering, which include certain of the Selling Shareholders, have certain
rights to register  those  shares  under the  Securities  Act. If  requested  by
holders of a majority of the Registrable Securities after the second anniversary
of the date of the initial public  offering,  Commtouch must file a registration
statement under the Securities Act covering all Registrable Securities requested
to be included by all holders of such Registrable  Securities.  Commtouch may be
required  to effect  up to two such  registrations.  Commtouch  has the right to
delay any such registration for up to 120 days under certain circumstances,  but
not more than once during any 12-month period.

In addition,  if Commtouch proposes to register any of its ordinary shares under
the Securities Act other than in connection with a company employee benefit plan
or a corporate  reorganization pursuant to Rule 145 under the Securities Act, or
a registration on any registration  form that does not permit secondary sales or
does not include  substantially  the same information as would be required to be
included  in  a  registration   statement   covering  the  sale  of  Registrable
Securities,  the holders of  Registrable  Securities  may require  Commtouch  to
include  all or a portion of their  shares in such  registration,  although  the
managing underwriter of any such offering has certain rights to limit the number
of shares in such registration.

Further,  a  majority  of the  holders of  Registrable  Securities  may  require
Commtouch to register all or any portion of their Registrable Securities on Form
F-3 when such form becomes available to Commtouch, subject to certain conditions
and  limitations.  All expenses  incurred in connection  with all  registrations
(other than fees,  expenses and disbursements of counsel retained by the holders
of  the  Registrable  Shares,  and  underwriters'  and  brokers'  discounts  and
commissions) will be borne by Commtouch.

The registration  rights described in the preceding three paragraphs expire five
years after the closing date of our initial public offering.

In addition,  the Company granted registration rights to Go2Net, Vulcan Ventures
and Microsoft pursuant to which their holdings in the Company were registered on
January 7, 2000 pursuant to a registration statement of which this prospectus is
a part.


                                       19

<PAGE>

Access to Information

We file reports with the Israeli Registrar of Companies regarding our registered
address,  our registered  capital,  our shareholders of record and the number of
shares  held by each,  the  identity  of the  directors  and  details  regarding
security  interests  on our assets.  In addition,  Commtouch  must file with the
Israeli  Registrar of Companies  its Articles of  Association  and a copy of any
special resolution adopted by a general meeting of shareholders. The information
filed with the Registrar of Companies is available to the public. In addition to
the information  available to the public,  our shareholders  are entitled,  upon
request,  to  review  and  receive  copies of all  minutes  of  meetings  of our
shareholders.

Transfer Agent and Registrar

The  transfer  agent and  registrar  for our  ordinary  shares is  Norwest  Bank
Minnesota, N.A.

                                       20

<PAGE>

                         SHARES ELIGIBLE FOR FUTURE SALE


Future sales of substantial amounts of our ordinary shares in the public market,
or the possibility of these sales occurring,  could adversely affect  prevailing
market  prices for our ordinary  shares or our future  ability to raise  capital
through an offering of equity  securities.  As of May 31, 2000 we had 16,415,069
ordinary shares  outstanding  (assuming the issuance of 368,270  ordinary shares
upon the assumed net  exercise at an assumed  share price of $18.94 per share of
the in-the-money  warrant to purchase 1,136,000 ordinary shares issued to Go2Net
at an exercise  price of $12.80 per share and  assuming  the issuance of 397,580
ordinary shares issuable upon exercise of options granted to executive  officers
and  directors  within 60 days of May 31,  2000 at a weighted  average  exercise
price of $24.20 per share.).  The 3,450,000  ordinary shares sold in our initial
public offering and the 1,344,086  ordinary  shares and the warrant  exercisable
for  1,136,000  ordinary  shares of Go2Net and Vulcan  Ventures,  as well as the
707,965  ordinary  shares of  Microsoft,  all of which are offered  hereby,  are
freely  tradable in the public market without  restriction  under the Securities
Act, unless the shares are held by "affiliates" of the Company,  as that term is
defined in Rule 144 under the Securities Act.

The remaining  ordinary shares outstanding upon completion of this offering will
be "restricted securities" as that term is defined under Rule 144. We issued and
sold  these  restricted  securities  in  private  transactions  in  reliance  on
exemptions from registration under the Securities Act. Restricted securities may
be sold in the public market only if they are  registered or if they qualify for
an exemption from  registration  under Rule 144 or Rule 701 under the Securities
Act, as summarized below.

Shares Subject to Restrictions

In  addition  to the  restrictions  imposed  by  the  securities  laws,  863,780
restricted  shares were issued to certain  Commtouch  employees under agreements
which give  Commtouch  Inc. a  repurchase  option on any  unvested  shares.  The
repurchase  option lapses  ratably over time. As of May 31, 2000,  approximately
358,999 ordinary shares are subject to repurchase.

Shares Subject to Restriction under Rule 144

Most of the  restricted  shares are subject to certain  volume and other  resale
restrictions  pursuant  to Rule  144  because  the  holders  are  affiliates  of
Commtouch.  In general,  under Rule 144, an affiliate of Commtouch,  or a person
(including a group of related persons whose shares must be aggregated  under the
Rule) who has beneficially  owned restricted  shares for at least one year, will
be entitled to sell in any  three-month  period a number of shares that does not
exceed the greater of

   *  1% of the then outstanding ordinary shares  (approximately  164,150 shares
      immediately following completion of the offering, assuming net exercise of
      the Go2Net warrant upon the assumptions noted above), or

   *  the average weekly trading volume during the four calendar weeks preceding
      the date on which notice of the sale is filed with the Commission.

Sales  pursuant  to Rule 144 are  subject to certain  requirements  relating  to
manner of sale,  notice and  availability  of current public  information  about
Commtouch. A person who was not an affiliate of Commtouch for 90 days before the
sale and who has  beneficially  owned the shares for at least two years may sell
under Rule 144(k) without regard to the above limitations.

Registration Rights

Some of our shareholders  have  contractual  rights which require us to register
their shares with the Commission. Pursuant to the registration rights of Go2Net,
Vulcan Ventures and Microsoft,  the Company filed the registration  statement of
which this  prospectus  is a part.  In  addition,  the holders of an  additional
approximately  4,516,040 ordinary shares have registration  rights under certain
circumstances.


Shares Under Employee Benefit Plans

On  January  20,  2000,  we filed a Form S-8  registration  statement  under the
Securities Act to register 5,400,000 ordinary shares issuable in connection with
option exercises and shares reserved for issuance

                                       21


<PAGE>


under all stock plans and  agreements as well as 150,000  ordinary  shares under
the  Company's  Employee  Stock  Purchase  Plan which the  Company  may issue to
employees  from time to time.  The Company also may issue  employee and director
stock  options from time to time.  Such  options are subject to vesting  periods
after  which  the  shares  may be  resold by the  holders,  subject  to Rule 144
limitations if the holder is an affiliate.  Of 3,227,316 options issued, 226,951
option  shares were  vested and  unexercised  as of May 31,  2000 and  1,185,055
options had been exercised.

                              PLAN OF DISTRIBUTION

The Selling  Securityholders may sell, directly or through brokers, the ordinary
shares and warrant in one or more long or short transactions at fixed prices, at
market prices at the time of sale, at varying  prices  determined at the time of
sale or at negotiated prices.

The Selling  Securityholders  may offer  their  shares and the warrant in one or
more of the following transactions:

* On any national securities exchange or quotation service on which the ordinary
  shares  may be  listed or quoted  at the time of sale,  including  the  Nasdaq
  National Market;

* In the over-the-counter market;

* In private transactions;

* Through options or other derivative instruments;

* By pledge to secure debts or other obligations;

* Through block transactions;

* Any other legally available means; or

* A combination of any of the above transactions.

In connection with such sales, the Selling Securityholders and any participating
broker may be deemed to be  "underwriters"  of the shares  within the meaning of
the  Securities  Act,  although  the  offering  of these  securities  may not be
underwritten  by  a  broker-dealer   firm.  Such   broker-dealers   may  receive
compensation in the form of underwriting  discounts,  concessions or commissions
from the Selling  Securityholders.  Any such commissions and profits realized on
any  resale  of the  shares  and  warrant  might be  deemed  to be  underwriting
discounts and  commissions  under the Securities Act. Sales in the market may be
made  to  broker-dealers  making  a  market  in the  ordinary  shares  or  other
broker-dealers,  and such broker-dealers,  upon their resale of such securities,
may be deemed to be underwriters in this offering.

The  Company  will bear all costs and  expenses  of the  registration  under the
Securities  Act and certain  state  securities  laws of the ordinary  shares and
warrant,  other than any discounts or commissions  payable with respect to sales
of such  securities.  We  estimate  that our  expenses in  connection  with this
offering will be approximately $500,000.

From time to time this  prospectus may be supplemented or amended as required by
the Securities  Act. During any time when a supplement or amendment is required,
the  Selling  Securityholders  are  required  to stop  making  sales  until  the
prospectus has been supplemented or amended. Further, the Company is required to
maintain  the  effectiveness  of the  Registration  Statement  during the period
ending  on (i) the date the  warrant  is fully  exercised  and all the  ordinary
shares offered by this prospectus, including the shares available on exercise of
the  warrant,  are sold or (ii) two years  from the date of our  initial  public
offering, whichever occurs first.

We will make copies of this prospectus available to the Selling  Securityholders
and have informed the Selling Securityholders of the need for delivery of a copy
of this prospectus to each purchaser of the ordinary shares or the warrant prior
to or at the time of such sale.

Pursuant  to the terms  under which the  ordinary  shares and the  warrant  were
issued to the Selling  Securityholders,  the Company has agreed to indemnify the
Selling Securityholders and any

                                       22

<PAGE>

underwriter against such liabilities as they may incur as a result of any untrue
statement  of a  material  fact in the  Registration  Statement  of  which  this
prospectus is a part, or any omission herein or therein to state a material fact
necessary  in  order  to  make  the  statements   made,  in  the  light  of  the
circumstances under which they were made, not misleading.  Such  indemnification
includes  liabilities  under the Securities Act, the Securities  Exchange Act of
1934,  as amended (the  "Exchange  Act"),  state  securities  laws and the rules
thereunder, but excludes liabilities for statements or omissions that were based
on information  provided by the Selling  Securityholders,  as to which they have
agreed to indemnify the Company and any underwriter.

Each  Selling   Securityholder   and  any  other  persons   participating  in  a
distribution  of  securities  will be subject to  applicable  provisions  of the
Exchange  Act and the  rules  and  regulations  thereunder,  including,  without
limitation,  Regulation M, which may restrict  certain  activities of, and limit
the timing of purchases and sales of securities by, Selling  Securityholders and
other persons participating in a distribution of securities.  Furthermore, under
Regulation M, persons  engaged in a  distribution  of securities  are prohibited
from simultaneously  engaging in market making and certain other activities with
respect  to  such  securities  for a  specified  period  of  time  prior  to the
commencement  of  such   distribution,   subject  to  specified   exceptions  or
exemptions.  All of the foregoing may affect the marketability of the securities
offered hereby.


                                  LEGAL MATTERS

Certain  legal  matters with respect to United  States law are being passed upon
for Commtouch by McCutchen,  Doyle, Brown & Enersen, LLP, Palo Alto, California.
The  validity of the  ordinary  shares  offered  hereby is being passed upon for
Commtouch  by  Naschitz,  Brandes  & Co.,  Tel-Aviv,  Israel.  The  partners  of
Naschitz, Brandes & Co. and McCutchen,  Doyle, Brown & Enersen, LLP beneficially
own, in the aggregate, less than 1% of the outstanding shares of the Company.


                                     EXPERTS

Kost,  Forer &  Gabbay,  a member  of Ernst & Young  International,  independent
auditors,  have audited our consolidated  financial  statements  included in our
Annual report on Form 20-F for the year ended December 31, 1999, as set forth in
their  report,  which  is  incorporated  by  reference  in this  prospectus  and
elsewhere  in  the  registration   statement.   Our  financial   statements  are
incorporated by reference in reliance on Kost, Forer and Gabbay's report,  given
on their authority as experts in accounting and auditing.


                       WHERE YOU CAN FIND MORE INFORMATION

We have filed a  registration  statement on Form F-1 (as amended by an amendment
filed on Form F-3) with the SEC for the shares and  warrant we are  offering  by
this  prospectus.  This  prospectus  does  not  include  all of the  information
contained in the  registration  statement.  You should refer to the registration
statement  and  its  exhibits  for  additional  information.  Whenever  we  make
reference  in this  prospectus  to any of our  contracts,  agreements  or  other
documents,  the references are not necessarily  complete and you should refer to
the exhibits  attached to the  registration  statement  for copies of the actual
contract,  agreement  or other  document.  We are  required  to file  annual and
special reports and other information with the SEC.

You can read our SEC filings,  including the  registration  statement,  over the
Internet at the SEC's web site at http://www.sec.gov. You may also read and copy
any  document  we file with the SEC at its public  reference  facilities  at 450
Fifth Street,  NW, Washington,  DC 20549, 7 World Trade Center,  Suite 1300, New
York, New York 10048 and Citicorp Center,  500 West Madison Street,  Suite 1400,
Chicago,  Illinois  60661-2511.  You may also obtain  copies of the documents at
prescribed  rates by writing to the Public  Reference  Section of the SEC at 450
Fifth Street,  NW, Washington,  DC 20549.  Please call the SEC at 1-800-SEC-0330
for further information on the operation of the public reference facilities. Our
SEC filings are also available at the office of the Nasdaq National Market.  For
further information on

                                       23

<PAGE>

obtaining copies of our public filings at the Nasdaq National Market, you should
call (212) 656-5060.  Information  contained on the Commtouch  websites does not
constitute part of this prospectus.

We are subject to certain of the informational requirements of the Exchange Act.
We, as a "foreign  private issuer," are exempt from the rules under the Exchange
Act  prescribing  certain  disclosure  and  procedural  requirements  for  proxy
solicitations and our officers,  directors and principal shareholders are exempt
from the reporting and  "short-swing"  profit recovery  provisions  contained in
Section 16 of the Exchange  Act,  with respect to their  purchases  and sales of
ordinary shares.  In addition,  we are not required to file quarterly reports or
to file annual and current reports and financial  statements with the Securities
and Exchange  Commission as frequently  or as promptly as U.S.  companies  whose
securities are  registered  under the Exchange Act.  However,  we intend to file
with the  Securities and Exchange  Commission,  within 180 days after the end of
each fiscal year, an annual report on Form 20-F containing  financial statements
that  will be  examined  and  reported  on,  with  an  opinion  expressed  by an
independent accounting firm, as well as quarterly reports on Form 6-K containing
unaudited  financial  information  for the first  three  quarters of each fiscal
year, within 60 days after the end of each such quarter.

                      INFORMATION INCORPORATED BY REFERENCE

The  SEC  allows  us  to  "incorporate  by  reference"   information  into  this
prospectus.  This means that we can  disclose  important  information  to you by
referring you to another  document filed by us with the Commission.  Information
incorporated  by reference is deemed to be part of this  prospectus,  except for
any information superseded by this prospectus or by information we file with the
Commission in the future.

The following documents are incorporated by reference:

    (a) Our Annual  Report on Form 20-F for the fiscal year ended  December  31,
    1999;

    (b) Our report on Form 6-K for the quarter ended March 31, 2000; and

    (c) The  description of our ordinary  shares  contained in the  registration
    statement under the Exchange Act on Form 8-A as filed with the Commission on
    June 25, 1999, and any subsequent  amendment or report filed for the purpose
    of updating this description.

In  addition,  all  subsequent  annual  reports  filed on Form 20-F prior to the
termination of this offering are incorporated by reference into this prospectus.
Also, we may  incorporate by reference our future reports on Form 6-K by stating
in  those  Forms  that  they are  being  incorporated  by  reference  into  this
prospectus.

We  will  provide  without charge to any person (including any beneficial owner)
to  whom  this  prospectus  has  been delivered, upon oral or written request, a
copy  of  any  document  incorporated  by  reference  in this prospectus but not
delivered  with  the prospectus (except for exhibits to those documents unless a
document  states  that  one  of  its  exhibits is incorporated into the document
itself).  Such  requests should be directed to James E. Collins, Chief Financial
Officer,  c/o  Commtouch  Inc.,  3945  Freedom  Circle,  Suite 400, Santa Clara,
California  95054.  Our  telephone  number  at  this location is (408) 653-4330.
After  July 31, 2000 such requests should be directed to James E. Collins, Chief
Financial  Officer,  c/o  Commtouch  Inc.,  2029  Stierlin Court, Mountain View,
California     94043-4655.     Our     corporate     website     address     is
http://www.commtouch.com.  The  information on our website is not intended to be
a part of this prospectus.


                                       24

<PAGE>

                       ENFORCEABILITY OF CIVIL LIABILITIES

We are  incorporated  in  Israel,  and  most of our  directors  and  many of the
executive officers and the Israeli experts named herein are not residents of the
United States and  substantially  all of their assets and our assets are located
outside  the  United  States.  Service  of process  upon our  non-U.S.  resident
directors  and  executive  officers  or the  Israeli  experts  named  herein and
enforcement  of  judgments  obtained  in the United  States  against us, and our
directors and executive  officers,  or the Israeli experts named herein,  may be
difficult to obtain within the United  States.  Commtouch Inc. is the U.S. agent
authorized to receive service of process in any action against us arising out of
this offering or any related  purchase or sale of securities.  We have not given
consent for this agent to accept service of process in connection with any other
claim.

We have been informed by our legal counsel in Israel,  Naschitz,  Brandes & Co.,
that  there is doubt as to the  enforceability  of civil  liabilities  under the
Securities  Act or the Exchange Act in original  actions  instituted  in Israel.
However,  subject to certain time  limitations,  an Israeli  court may declare a
foreign civil judgment enforceable if it finds that:

    * the judgment  was rendered by a court which was,  according to the laws of
      the state of the court, competent to render the judgment,

    * the judgment is no longer appealable,

    * the  obligation  imposed by the judgment is  enforceable  according to the
      rules  relating  to the  enforceability  of  judgments  in Israel  and the
      substance of the judgment is not contrary to public policy, and

    * the judgment is executory in the state in which it was given.

Even if the above conditions are satisfied,  an Israeli court will not enforce a
foreign  judgment  if it was given in a state  whose laws do not provide for the
enforcement of judgments of Israeli courts (subject to exceptional  cases) or if
its  enforcement is likely to prejudice the sovereignty or security of the State
of Israel. An Israeli court also will not declare a foreign judgment enforceable
if (i) the judgment was obtained by fraud, (ii) there was no due process,  (iii)
the judgment was rendered by a court not competent to render it according to the
laws of private  international  law in Israel,  (iv) the judgment is at variance
with another judgment that was given in the same matter between the same parties
and which is still  valid,  or (v) at the time the  action  was  brought  in the
foreign court a suit in the same matter and between the same parties was pending
before a court or tribunal in Israel.  Judgments rendered or enforced by Israeli
courts will generally be payable in Israeli currency.  Judgment debtors bear the
risk associated with converting  their awards into foreign  currency,  including
the risk of unfavorable exchange rates.

                                       25


<PAGE>

                            2,052,051 Ordinary Shares
                  Warrant to Purchase 1,136,000 Ordinary Shares
           1,136,000 Ordinary Shares Issuable Upon Exercise of Warrant




                            COMMTOUCH SOFTWARE LTD.



                               [GRAPHIC OMITTED]



                            -----------------------
                                   PROSPECTUS

                            -----------------------




                                        , 2000



<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


Item 14. Other Expenses of Issuance and Distribution.

The  following  table  sets  forth the  expenses  payable  by the  Company  (the
"Registrant")   in  connection  with  the  offering  of  the  securities   being
registered.  All of the amounts are  estimates  except for the SEC  registration
fee and the Nasdaq National Market filing fee.


         SEC registration fee ...............................  $   21,695
         Nasdaq National Market filing fee ..................      17,500
         Blue Sky fees and expenses .........................      10,000
         Printing and engraving expenses ....................      50,000
         Israeli Stamp Duty .................................     145,408*
         Legal fees and expenses ............................     100,000
         Accounting fees and expenses .......................     100,000
         Transfer agent and registrar fees and expenses .....      10,000
         Miscellaneous expenses .............................      45,397
                                                               ----------
            Total ...........................................  $  500,000
                                                               ==========
          ------------
          * Payable only upon exercise of the warrant.


Item 15. Indemnification of Directors and Officers.

Israeli  law  permits a  company  to insure  an  Office  Holder  in  respect  of
liabilities  incurred by him or her as a result of the breach of his or her duty
of care to the company or to another person, or as a result of the breach of his
or her fiduciary duty to the company, to the extent that he or she acted in good
faith and had  reasonable  cause to believe that the act would not prejudice the
company. A company can also insure an Office Holder for monetary  liabilities as
a result of an act or omission that he or she  committed in connection  with his
or her serving as an Office Holder.  Moreover, a company can indemnify an Office
Holder  for (a)  monetary  liability  imposed  upon him or her in favor of other
persons  pursuant to a court  judgment,  including a  compromise  judgment or an
arbitrator's  decision  approved  by  a  court  and  (b)  reasonable  litigation
expenses,  including attorneys' fees, actually incurred by him or her or imposed
upon him or her by a court, in an action, suit or proceeding brought against him
or her by or on behalf of the company or other persons,  or in connection with a
criminal  action which does not require  criminal  intent in which he or she was
convicted,  in each case in connection  with his or her  activities as an Office
Holder.

Our Articles of Association  allow us to insure and indemnify  Office Holders to
the fullest extent  permitted by law provided such insurance of  indemnification
is approved by our Audit  Committee.  Pursuant to these  provisions,  we have in
effect insurance policies in the amount of US $25 million covering our directors
and  officers.  The  Registration  Rights  Agreement  which we entered into with
Go2Net and Vulcan (filed as an exhibit to this registration statement), contains
certain provisions relating to indemnification of our directors and officers.

Certain members of our management team are officers of our subsidiary, Commtouch
Inc.,  a  California  Corporation,  or reside in  California.  The  Articles  of
Incorporation  of Commtouch Inc.  provide that the liability of the directors of
the corporation  for monetary  damages shall be eliminated to the fullest extent
permissible  under  California  law and that the  corporation  is  authorized to
provide  for the  indemnification  of agents of the  corporation,  as defined in
Section  317 of the  California  General  Corporation  Law,  in  excess  of that
expressly permitted by Section 317 for breach of duty to the corporation and its
shareholders to the fullest extent permissible under California law.


With  respect to all  proceedings  other than  shareholder  derivative  actions,
Section 317 permits a California  corporation to indemnify any of its directors,
officers or other agents only if such person acted in good faith and in a manner
such person  reasonably  believed to be in the best interests of the corporation
and, in the case of a criminal  proceeding,  had no reasonable  cause to believe
the conduct of such person was unlawful.  In the case of derivative  actions,  a
California corporation may indemnify

                                      II-1

<PAGE>

any of its directors, officers or agents only if such person acted in good faith
and in a  manner  such  person  believed  to be in  the  best  interests  of the
corporation  and  its  shareholders.  Furthermore,  in  derivative  actions,  no
indemnification  is  permitted  (i) with  respect to any matter with  respect to
which the  person to be  indemnified  has been held  liable to the  corporation,
unless such  indemnification  is approved by the court;  (ii) of amounts paid in
settling or otherwise  disposing of a pending action without court approval;  or
(iii) of expenses  incurred in  defending a pending  action  which is settled or
otherwise  disposed of without  court  approval.  To the extent that a director,
officer or agent of a corporation  has been  successful on the merits in defense
of any  proceeding  for which  indemnification  is  permitted  by Section 317, a
corporation  is  obligated  by Section  317 to  indemnify  such  person  against
expenses actually and reasonably incurred in connection with the proceeding.

Pursuant  to the terms  under which the  ordinary  shares and the  warrant  were
issued to the Selling  Securityholders,  the Company has agreed to indemnify the
Selling Securityholders and any underwriter against such liabilities as they may
incur as a result of any untrue statement of a material fact in the Registration
Statement,  or any omission  therein to state a material fact necessary in order
to make the statements made, in light of the circumstances under which they were
made,  not  misleading.  Such  indemnification  includes  liabilities  under the
Securities  Act,  the  Exchange  Act,  state   securities  laws  and  the  rules
thereunder, but excludes liabilities for statements or omissions that were based
on information  provided by Go2Net or Vulcan  Ventures,  as to which the Selling
Securityholders  have agreed to indemnify the Company and any  underwriter.  The
Company  has also  agreed  to  indemnify  Go2Net  and  Vulcan  Ventures  against
withholding tax, tax on capital gains,  dividends or other income,  any transfer
tax,  stamp  duty or  similar  tax,  or any  other  form of tax,  assessment  or
imposition  imposed by the State of Israel with respect to their acquisition and
subsequent  sale of the ordinary shares and the warrant as well as certain other
matters, including the requirement to pay additional amounts to reimburse Go2Net
and Vulcan Ventures for any U.S. taxes on the amount of such indemnity.

Item 16. Exhibits.


<TABLE>
<CAPTION>

  Exhibit
  Number                                       Description of Document
----------   -------------------------------------------------------------------------------------------
<S>          <C>
    3.1      Memorandum of Association of the Registrant.(1)
    3.2      Articles of Association of the Registrant.(1)
    4.1      Specimen Certificate of Ordinary Shares.(1)
    4.2      Amended and Restated Registration Rights Agreement dated as of April 19, 1999.(1)
  4.2.1      Amendment No. 1 to Amended and Restated Registration Rights Agreement dated as of
             December 29, 1999.(4)
  4.2.2      Amendment No. 2 to Amended and Restated Registration Rights Agreement dated as of
             March 10, 2000.(5)
    4.3      Form of Tag-Along Rights (Right of First Refusal and Co-Sale) Agreement dated as of
             December 23, 1998.(1)
    4.4      Form of Drag-Along Letter dated as of April 15, 1999.(1)
    5.1      Opinion of Naschitz, Brandes & Co., Israeli counsel to the Registrant, as to certain legal
             matters with respect to the legality of the shares.
   10.1      Registrant's 1996 CSI Stock Option Plan and forms of agreements thereunder.(1)
   10.2      Registrant's form of Stock Option Agreement for Israeli Employees.(1)
   10.3      Registrant's 1999 Stock Option Plan and form of agreement thereunder.(1)
   10.4      Commtouch Software Ltd. 1999 Nonemployee Directors Stock Option Plan.(1)
   10.5      Commtouch Software Ltd. 1999 Employee Stock Purchase Plan and forms thereunder.(1)
   10.6      Sublease between ASCII of America, Inc. and Commtouch for Commtouch's offices in
             Santa Clara, California, dated December 16, 1998.(1)
   10.7      Lease between DeAnza Building and Commtouch for Commtouch's offices in Sunnyvale,
             California, dated February 5, 1996, as amended.(1)
   10.8      Form of Letter Agreement between the Registrant and U.S. Bancorp Piper Jaffray.(2)


                                      II-2

<PAGE>


   Exhibit

   Number                                         Description of Document
------------   ---------------------------------------------------------------------------------------------
   10.9        Form of Customized Web-based Email Service Agreement by and between Go2Net, Inc.
               and the Registrant.(3)
 10.9.1        Form of Share Warrant for Go2Net, Inc. to purchase ordinary shares of the Registrant.(3)
 10.9.2        Form of Share Warrant for Microsoft Corporation to purchase ordinary shares of the
               Registrant dated October 26, 1999.(4)
 10.9.3        Amendment dated December 29, 1999 to Form of Share Warrant for Microsoft
               Corporation to purchase ordinary shares of the Registrant.(4)
 10.9.4        Lockup Agreement between the Registrant and Microsoft Corporation dated December 29,
               1999.(4)
   10.10       Form of Share Purchase Agreement by and among the Registrant, Go2Net, Inc. and
               Vulcan Ventures Incorporated.(3)
10.10.1        Form of Registration Rights Agreement by and among the Registrant, Go2Net, Inc. and
               Vulcan Ventures Incorporated.(3)
10.10.2        Form of Letter Agreement between the Registrant and Selling Securityholders extending
               deadline for SEC registration.(4)
   21.1        Subsidiaries of the Registrant.(1)
   23.1        Consent of Kost, Forer & Gabbay, independent auditors.*
   23.2        Consent of Naschitz, Brandes & Co. (contained in Exhibit 5.1)
   23.3        Consent of McCutchen, Doyle, Brown & Enersen, LLP.
   24.1        Power of Attorney of directors and certain officers of the Registrant.
   99.1        Press Release of the Registrant, dated July 7, 1999.(2)
   99.2        Memorandum of Understanding between the Registrant, Go2Net, Inc. and Vulcan Ventures
               Incorporated, dated July 7, 1999.(2)

<FN>

------------
(1) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 1
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-78531.
(2) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 4
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-78531.
(3) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 5
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-78531.
(4) Filed with Pre-Effective Amendment No. 1 to Registration Statement.
(5) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 2
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-89773, filed March 28, 2000.
 * Filed herewith, remaining exhibits previously filed.
</FN>
</TABLE>

Item 17. Undertakings.

(a) The undersigned Registrant hereby undertakes:

    (1) To file  during any period in which  offers or sales are being  made,  a
post-effective amendment to this Registration Statement:

         (i) to include  any  prospectus  required  by Section  10(a)(3)  of the
    Securities Act;

         (ii) to reflect in the prospectus any facts or events arising after the
    effective   date  of  the   Registration   Statement  (or  the  most  recent
    post-effective  amendment thereof) which,  individually or in the aggregate,
    represent  a  fundamental  change  in  the  information  set  forth  in  the
    Registration Statement;

         (iii) to include any material  information  with respect to the Plan of
    Distribution not previously  disclosed in the Registration  Statement or any
    other material change to such information in the Registration Statement.

Provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs  is  contained  in periodic  reports  filed with or  furnished to the
Commission  by the  Registrant  pursuant  to Section 13 or Section  15(d) of the
Exchange Act that are incorporated by reference in the Registration Statement.


                                      II-3

<PAGE>

    (2) That, for the purpose of determining  any liability  under the 1933 Act,
each such  post-effective  amendment  shall be  deemed to be a new  Registration
Statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof.

    (3) To remove from  registration by means of a post-effective  amendment any
of the securities being registered which remain unsold at the termination of the
offering.

    (4) To file a  post-effective  amendment  to the  registration  statement to
include any  financial  statements  required by Rule 3-19 of this chapter at the
start of any delayed  offering or  throughout a continuous  offering.  Financial
statements  and  information  otherwise  required  by  Section  10(a)(3)  of the
Securities Act need not be furnished,  provided that the Registrant  includes in
the prospectus,  by means of a post-effective  amendment,  financial  statements
required  pursuant to this paragraph (a)(4) and other  information  necessary to
ensure that all other  information  in the  prospectus is at least as current as
the date of those  financial  statements.  Notwithstanding  the foregoing,  with
respect to registration statements on Form F-3, a post-effective  amendment need
not be filed to include financial statements and information required by Section
10(a)(3) of the  Securities  Act or Rule 3-19 of this chapter if such  financial
statements  and  information  are  contained in periodic  reports  filed with or
furnished to the Commission by the Registrant  pursuant to Section 13 or Section
15(d) of the Exchange Act that are incorporated by reference in the Form F-3.



(b)  The  undersigned   Registrant  hereby  undertakes  that,  for  purposes  of
determining  any liability  under the Securities Act of 1933, each filing of the
Registrant's  annual  report  pursuant to section  13(a) or section 15(d) of the
Securities  Exchange  Act of  1934  that is  incorporated  by  reference  in the
registration  statement  shall  be  deemed  to be a new  registration  statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

(c) Insofar as indemnification  for liabilities arising under the Securities Act
of 1933 may be permitted to directors,  officers and controlling  persons of the
Registrant pursuant to the foregoing  provisions,  or otherwise,  the Registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore,  unenforceable. In the event that a claim for indemnification
against  such  liabilities  (other than  payment by the  Registrant  of expenses
incurred or paid by a director,  officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director,  officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as  expressed  in the  Securities  Act and will be  governed by the final
adjudication of such issue.


                                      II-4

<PAGE>

                                   SIGNATURES


Pursuant to the  requirements  of the Securities Act of 1933, the registrant has
duly caused this  Amendment  to the  Registration  Statement to be signed on its
behalf  by the  undersigned,  thereunto  duly  authorized,  in the city of Santa
Clara, state of California, on July 26, 2000.

                                          COMMTOUCH SOFTWARE LTD.


                                          By:     /s/ JAMES E. COLLINS*
                                             -----------------------------
                                                     James E. Collins
                                                  Chief Financial Officer


Pursuant to the  requirements  of the Securities Act of 1933,  this Amendment to
the  Registration  Statement  has been  signed by the  following  persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>

             Name                                Title                         Date
-----------------------------   ---------------------------------------   --------------
<S>                             <C>                                       <C>
    /s/ GIDEON MANTEL*          Chief Executive Officer and Director      July 26, 2000
---------------------------       (Principal Executive Officer)
           Gideon Mantel


    /s/ JAMES E. COLLINS*       Chief Financial Officer (Principal        July 26, 2000
---------------------------        Financial Officer)
        James E. Collins


    /s/ DEVYANI PATEL*          Controller                                July 26, 2000
---------------------------
        Devyani Patel

    /s/ AMIR LEV*               Director                                  July 26, 2000
---------------------------
        Amir Lev

    /s/ ALLAN C. BARKAT*        Director                                  July 26, 2000
---------------------------
        Allan C. Barkat

    /s/ YAIR SAFRAI*            Director                                  July 26, 2000
---------------------------
        Yair Safrai

    /s/ THOMAS CAMP*            Director                                  July 26, 2000
---------------------------
        Thomas Camp

    /s/ RICHARD SORKIN*         Director                                  July 26, 2000
---------------------------
        Richard Sorkin

    /s/ JAMES E. COLLINS        *Individually and as Attorney-in-fact     July 26, 2000
---------------------------      and Authorized U.S. Representative
         James E. Collins




                                      II-5


<PAGE>

                                  Exhibit Index


  Exhibit
  Number                                         Description of Document
----------   -----------------------------------------------------------------------------------------------
    3.1      Memorandum of Association of the Registrant.(1)
    3.2      Articles of Association of the Registrant.(1)
    4.1      Specimen Certificate of Ordinary Shares.(1)
    4.2      Amended and Restated Registration Rights Agreement dated as of April 19, 1999.(1)
  4.2.1      Amendment No. 1 to Amended and Restated Registration Rights Agreement dated as of
             December 29, 1999.(4)
  4.2.2      Amendment No. 2 to Amended and Restated Registration Rights Agreement dated as of
             March 10, 2000.(5)
    4.3      Form of Tag-Along Rights (Right of First Refusal and Co-Sale) Agreement dated as of
             December 23, 1998.(1)
    4.4      Form of Drag-Along Letter dated as of April 15, 1999.(1)
    5.1      Opinion of Naschitz, Brandes & Co., Israeli counsel to the Registrant, as to certain legal
             matters with respect to the legality of the shares.
   10.1      Registrant's 1996 CSI Stock Option Plan and forms of agreements thereunder.(1)
   10.2      Registrant's form of Stock Option Agreement for Israeli Employees.(1)
   10.3      Registrant's 1999 Stock Option Plan and form of agreement thereunder.(1)
   10.4      Commtouch Software Ltd. 1999 Nonemployee Directors Stock Option Plan.(1)
   10.5      Commtouch Software Ltd. 1999 Employee Stock Purchase Plan and forms thereunder.(1)
   10.6      Sublease between ASCII of America, Inc. and Commtouch for Commtouch's offices in
             Santa Clara, California, dated December 16, 1998.(1)
   10.7      Lease between DeAnza Building and Commtouch for Commtouch's offices in Sunnyvale,
             California, dated February 5, 1996, as amended.(1)
   10.8      Form of Letter Agreement between the Registrant and U.S. Bancorp Piper Jaffray.(2)
   10.9      Form of Customized Web-based Email Service Agreement by and between Go2Net, Inc.
             and the Registrant.(3)
 10.9.1      Form of Share Warrant for Go2Net, Inc. to purchase ordinary shares of the Registrant.(3)
 10.9.2      Form of Share Warrant for Microsoft Corporation to purchase ordinary shares of the
             Registrant dated October 26, 1999.(4)
 10.9.3      Amendment dated December 29, 1999 to Form of Share Warrant for Microsoft
             Corporation to purchase ordinary shares of the Registrant.(4)
 10.9.4      Lockup Agreement between the Registrant and Microsoft Corporation dated December 29,
             1999.(4)

   10.10     Form of Share Purchase Agreement by and among the Registrant, Go2Net, Inc. and
             Vulcan Ventures Incorporated.(3)
10.10.1      Form of Registration Rights Agreement by and among the Registrant, Go2Net, Inc. and
             Vulcan Ventures Incorporated.(3)
10.10.2      Form of Letter Agreement between the Registrant and Selling Securityholders extending
             deadline for SEC registration.(4)
   21.1      Subsidiaries of the Registrant.(1)
   23.1      Consent of Kost, Forer & Gabbay, independent auditors.*


<PAGE>

 Exhibit
 Number                                   Description of Document
--------   -------------------------------------------------------------------------------------
23.2       Consent of Naschitz, Brandes & Co. (contained in Exhibit 5.1)
23.3       Consent of McCutchen, Doyle, Brown & Enersen, LLP.
24.1       Power of Attorney of directors and certain officers of the Registrant.
99.1       Press Release of the Registrant, dated July 7, 1999.(2)
99.2       Memorandum of Understanding between the Registrant, Go2Net, Inc. and Vulcan Ventures
           Incorporated, dated July 7, 1999.(2)
</TABLE>

------------
(1) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 1
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-78531.
(2) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 4
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-78531.
(3) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 5
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-78531.
(4) Filed with Pre-Effective Amendment No. 1 to Registration Statement.
(5) Incorporated  by  reference to similarly numbered exhibit in Amendment No. 2
    to  Registration  Statement on Form F-1 of Commtouch Software Ltd., File No.
    333-89773, filed March 28, 2000.
 *  Filed herewith, remaining exhibits previously filed.



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