hi I have got the problem with my exchange server 2007 now i can't log in to mailbox ,. please help me for this case Product: Exchange Event ID: 1016 Source: MSExchange ActiveSync Version: 8.0 Symbolic Name: MailboxBackingOff Message: Exchange ActiveSync has encountered repeated failures when it tries to access data on Mailbox server [%1]. Exchange ActiveSync will temporarily stop making Exchange ActiveSync requests to the Mailbox server. The process will be postponed for [%2] seconds. This may be caused if the Mailbox server is overloaded. If this event is frequently logged, review the Application log for other events that could indicate the root cause of performance problems on the Mailbox server specified in the event description.

Hi This is event explanation. http://www.microsoft.com/technet/support/ee/transform.aspx?ProdName=Exchange&ProdVer=8.0&EvtID=1016&EvtSrc=MSExchange+ActiveSync&LCID=1033 According to this explanation, we can’t find root problem of it. You should tell me the manufacture and system of your mobile. Do you meet any error when you configure client mail setting. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.