[Symptom]

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In Cached Mode Outlook, every time you open the Outlook, a synchronization log will be logged like below:

8:53:54 Synchronizer Version 14.0.4760
8:53:54 Synchronizing Mailbox 'Dainelli Dario'
8:53:54 Synchronizing Hierarchy[..]

8:54:01 Synchronizing Forms

8:54:01 Downloading from server abc.contoso.com

8:54:01 Error synchronizing folder

8:54:01           [80004005-501-4B9-560]

8:54:01           The client operation failed.

8:54:01           Microsoft Exchange Information Store

8:54:01           For more information on this failure, click the URL below:

8:54:01           http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=80004005-501-4b9-560

8:56:01 Done

[Cause]

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It is a known issue. This issue occur when you have Organizational Forms Library feature enabled on Exchange Server. When Outlook tries to sync the folder (All the Organization Forms store in the Exchange Servers Public Folder Database -> System Folders ->EFORMS Registry), an unexpected sync error occurs. However, this does not mean this behavior infects the Organization Forms data synchronization. We have done tests on serval machines. The result is users can still use Organizational Forms properly with this error synchronization log in Outlook.

[Solution]

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You have two options:

1. Just safely ignore this error because there is no user impacts.

2. If you dont need the Organizational Forms Library feature, you can just disable this feature to workaround this issue.