Hello, Are the contacts part of the same ost file and what about if I delete a contact can I recover them from Exchange data backups ? Thanks

The OST is a local file on the PC and contains the everything that's synchronized between the server when using cached mode and/or offline folders. How you would recover depends on the version of Exchange Server you're running, something you didn't share with us.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Exchange 2010

You can restore the mailbox database to a recovery storage group and use Restore-Mailbox to restore the Contacts folder.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

I thought that the Recovery Storage group has been removed in Exchange 2010

Hi You can read through these links for recovery http://technet.microsoft.com/en-us/library/dd876954.aspx http://technet.microsoft.com/en-us/library/ee332321.aspx http://technet.microsoft.com/en-us/library/ee332351.aspxJonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog