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.

Details
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.
   
Explanation

This Error event indicates that repeated failures occurred when Exchange ActiveSync tried to access data on the computer that is running the Mailbox server role. Specifically, multiple unsuccessful mailbox requests/access occurred. Another symptom that you may find is that Exchange ActiveSync users report that it takes them more time than usual to synchronize their devices with the computer that is running Microsoft® Exchange Server. This event may be logged if the mailbox server is overloaded. For example, this error may indicate that there are too many users on the mailbox server. It may also indicate that there are other performance issues with the mailbox server.

   
User Action

To resolve this error, consider the following:

  • If this event is infrequently logged, no user action is required.

  • If this event is frequently logged, take one or more of these steps:

    • Consider decreasing the load on the mailbox server specified in the event description.

    • 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.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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