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In a Microsoft Exchange Server 2007 environment, after you set a completed task to "Incomplete" in Outlook Web Access (OWA), this task is always displayed in the Complete tasks view. You cannot find it in the Active tasks view. If you check the details of this incomplete task in OWA, the status is "In progress." This may confuse OWA users and affect some Exchange Web Service-based applications that perform task operations.
This issue occurs because a property that affects the Complete status is set incorrectly during the processing.
To resolve this problem, install Update Rollup 8 for Exchange 2007 Service Pack 1. For more information about Update Rollup 8 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: