Distribution Groups in Outlook don’t show members

November 27, 2013

After migrating an Exchange Server I noticed that when I added an Distribution Group to my Mail I could not see the members of that group ?

Error when clicking the + sign to open up the members window.

Cannot perform me requested operation. The command selected is not valid for this recipient. The operation failed.

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Solution was simple.

Close Outlook first, next go to the folder %APPDATA% –> Local\Microsoft\Outlook

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And clear all *.oab Files Open up sync again and everything is working fine again.