FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person * Duale Marc A   2. Issuer Name and Ticker or Trading Symbol IRON MOUNTAIN INC [IRM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President, Iron Mountain Int'l (Last) (First) (Middle) THIRD FLOOR, COTTONS CENTRE, TOOLEY STREET 3. Date of Earliest Transaction (Month/Day/Year) 03/07/2012 (Street) LONDON, X0 SE1 2TT 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, par value $.01 per share 03/11/2012   A   1,066 (1) A $ 0 1,066 D   Common Stock, par value $.01 per share 03/11/2012   F   48 D $ 28.74 1,018 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.		SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Performance Units

(2)

03/07/2012

A

7,088 (3)

(4)

(4)

Common Stock

7,088

$ 0

7,088

D

Restricted Stock Units

(5)

03/09/2012

A

10,396

(6)

(6)

Common Stock

10,396

$ 0

10,396

D

Restricted Stock Units

(5)

03/11/2012

D

1,066

(7)

(7)

Common Stock

1,066

$ 0

2,136

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Duale Marc A THIRD FLOOR, COTTONS CENTRE TOOLEY STREET LONDON, X0 SE1 2TT			President, Iron Mountain Int'l

Signatures

/s/ Sarah Cammarata, under Power of Attorney dated December 2, 2010, from Marc A. Duale		03/13/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the reporting person.
(2)	Each performance unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.
(3)	The PUs were previously granted to the reporting person on March 11, 2011, and on March 7, 2012 the Compensation Committee of Iron Mountain Incorporated's Board of Directors determined the actual award of PUs under the grant after completion of the relevant performance period.
(4)	The PUs fully vest on March 11, 2014, subject to certain exceptions, if the officer is, as of that date, continuing to perform services for Iron Mountain Incorporated.
(5)	Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock.
(6)	The RSUs vest in three annual installments beginning on the first anniversary of the date of grant.
(7)	The RSUs, representing a right to purchase a total of 3,202 shares of Iron Mountain Incorporated common stock, were granted in March 2011 and vest in three annual installments beginning on March 11, 2012, which was the first anniversary of the date on which the RSUs were granted.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.