Article ID: 968172 - View products that this article applies to.
After you change the Task content type for a SharePoint site collection, you cannot synchronize task items on a newly created Task list. When you try to save the changes, you may receive the following error message:
Even after you revert to the previous Task content type, synchronization still does not work.
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To resolve this issue, apply the following hotfix package:
(http://support.microsoft.com/kb/968857/ )Description of the Windows SharePoint Services 3.0 hotfix package (Sts.msp): April 28, 2009
LimitationAfter you apply the hotfix package, you cannot resolve the issue for the existing site collections. However, this issue will not occur for the new site collections.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.