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<PAGE> EXHIBIT 23 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report dated June 26, 2000, included in this Form 11-K, into Iron Mountain Incorporated's previously filed registration statements on Forms S-3 (File Nos. 333-91577 and 333-72191), and S-8 (File Nos. 333-43787, 333-69859, and 333-95901). /s/ ARTHUR ANDERSEN LLP Boston, Massachusetts June 26, 2000
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