You cannot synchronize appointments with a mobile device after you install Update Rollup 12 or Update Rollup 13 in Microsoft Dynamics CRM 4.0

After you install Update Rollup 12 or Update Rollup 13 in Microsoft Dynamics CRM 4.0, appointments that are created in Microsoft Dynamics CRM cannot be synchronized with a mobile device.

This problem is fixed in the latest cumulative update rollup for Microsoft Dynamics CRM 4.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Note This problem was originally fixed in Update Rollup 14 for Microsoft Dynamics CRM 4.0.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: For more information about Microsoft Business Solutions CRM software hotfix and update package terminology, click the following article number to view the article in the Microsoft Knowledge Base: