Dear all I have two servers one running EX03 SP2 (7638.2:SP2) with mapi32.dll version - 6.5.7638.1 and cdo.dll version - 6.5.7638.2 and then the Blackberry server is running ESM 7638.2:SP2 with mapi32.dll version - 1.0.2536.0 and cdo.dll version - 6.5.9644.0 I am having problems were a user is unable to synchronise calendar entries from their BB to their outlook, however calendar entries from outlook to BB work I understand that the mapi32.dll and cdo.dll need to match on both servers, how can I update the mapi32.dll and cdo.dll files on the blackberry server to match the exchange server, I am reluctant to simply copy and paste from one server to the other as this may cause issues with mail flow.

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" understand that the mapi32.dll and cdo.dll need to match on both servers, how can I update the mapi32.dll and cdo.dll files on the blackberry server to match the exchange server, I am reluctant to simply copy and paste from one server to the other as this may cause issues with mail flow." Not always, it is recommened but not always the case. Most of the time yes, confirm with RIM.Sukh