Iron Mountain (IRM) 10-Q 2008 Q1 Quarterly report

QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

        In connection with the filing of the Quarterly Report on Form 10-Q for the quarter ended March 31, 2008 (the "Report") by Iron Mountain Incorporated (the "Company"), the undersigned, as the Chief Executive Officer of the Company, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1.

the Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and



2.

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 9, 2008

/s/  C. RICHARD REESE      C. Richard Reese
Chief Executive Officer

QuickLinks

EXHIBIT 32.1