The synchronization session of the mobile device fails, and you receive error code "0X85010015" when you try to synchronize a mobile device by using Exchange ActiveSync in Exchange Server 2007

Consider the following scenario.

• You use a server that is running Microsoft Exchange Server 2007. This server is running Windows Server 2003.
• The Exchange Server 2007 server is configured to have a Client Access server role.
• You set the regional language settings of the Windows Server 2003 operating system to Turkish.

In this scenario, when you try to synchronize a mobile device with the Exchange 2007 Client Access server by using�Microsoft Exchange ActiveSync, the synchronization session of the mobile device fails. Additionally, you receive the following error code: Note�If you enable verbose logging in Exchange ActiveSync, the "501" error message is logged in the server.

To resolve this problem, install Update Rollup 3 for Exchange Server 2007.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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