* Q4 EPS $0.27 vs est. $0.24
* Q4 rev $779 mln vs est $776.89 mln
* Sees FY10 EPS $1.07-$1.20 vs est $1.07
Feb 25 (Reuters) - Iron Mountain (IRM.N), which helps firms archive records and store online data, posted a better-than-expected quarter helped by a lower tax rate and forecast strong full-year results.
For the fourth quarter, the company's net income attributable to shareholders rose to $61 million, or 30 cents per share, from $1 million, or a cent per share, a year ago.
Excluding items, the company earned 27 cents per share. Analysts were expecting 24 cents per share, according to Thomson Reuters I/B/E/S.
Revenue rose 4 percent to $779 million.
The company expects full-year adjusted earnings of $1.07 to $1.20 per share on revenue of $3.19 billion to $3.26 billion.
Analysts were looking for earnings of $1.07 cents on revenue of $3.19 billion.
Separately, Iron Mountain's board approved a new share buyback program of up to $150 million.
The company also announced a first quarter dividend of $0.0625 per share.
Shares of the Boston-based company closed at $24.30 Wednesday on the New York Stock Exchange. (Reporting by Mansi Dutta in Bangalore, Editing by Saumyadeb Chakrabarty)