June 27 (Reuters) - Microsoft Corp ( MSFT ) is informing

some of its customers that a Russian state-sponsored hacking

group breached its internal systems and accessed their emails,

Bloomberg News reported on Thursday, citing a company

spokesperson.

The technology giant is also providing previously notified

clients with details of which data was taken, the report said.

Microsoft ( MSFT ) did not immediately respond to a request emailed

by Reuters for comment and calls to spokespersons went

unanswered.

The company had said in January, too, that a Russian

state-sponsored group had hacked into its corporate systems and

stolen some emails and documents from staff accounts.