Assume that you are in an on-premises Microsoft Exchange Server 2010 environment. A mobile device synchronizes recipient information cache through Exchange ActiveSync (EAS). In this situation, the device unexpectedly receives Exchange ActiveSync status code 8 (Object Not Found). When this issue occurs, additional synchronize requests receive status code 8.
This issue occurs because some EAS clients cannot handle status code 8.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the status codes for the Sync command, go to the following Microsoft website: