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Junk Email settings do not work as expected after you migrate or move a mailbox to an Exchange Server 2010 SP1 Mailbox server
Article ID: 2695011 - View products that this article applies to.
Consider the following scenario:
This issue occurs because Exchange Server 2010 SP1 does not generate a change number when you migrate or move a mailbox. Therefore, the PR_CHANGE_KEY property of the Junk Email rules message is missing.
To resolve this issue, install the following update rollup before you move or migrate a mailbox:
2685289Note This update rollup will not resolve this issue if you apply the update after you move or migrate a mailbox.
(http://support.microsoft.com/kb/2685289/ )Description of Update Rollup 3 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the Outlook 2010 Junk Email filter, go to the following Microsoft website:
General information about the Outlook 2010 Junk Email filterFor more information about how to deploy Junk Email settings by using Group Policy, go to the following Microsoft website:
How to deploy Junk Email settings by using Group PolicyFor more information about the PR_CHANGE_KEY property, go to the following Microsoft website:
General information about the PR_CHANGE_KEY propertyFor more information about a similar issue that occurs after you move or migrate a mailbox, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/2655142/ )Outlook Junk Email settings ignored after moving mailbox to Exchange Server 2010