This issue seems to occur with folders that were imported from another service (IMAP, etc.) or an older version of Outlook. The workaround is to re-create the folder in Exchange 2010 (or Office 365) and then move data to it from the older folder.
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Article ID: 786, Created: November 11, 2013 at 3:30 PM, Modified: June 10, 2016 at 4:19 PM