After migrating from Exchange 2007 to Exchange 2013 users are experiencing an issue with Outlook when mail is sorted by category. While in "by categories" view and clicking through non-categorized mail it will eventually yank focus back up to the top of the inbox. It doesn't jump to the first message, but actually up to the category header, which in this case is the (none) category. This erratic behavior causes usability issues as the user cannot work within the inbox without frequently having the focus jerked away.
It only impacts users on Exchange 2013 (I have the 07 server coexisting and still have some users on 07, it doesn't impact them at all). We are not using Cached Exchange Mode on with any users.
It doesn't matter which client they are using - Outlook 2010 or Outlook 2013, the issue is the same.
Launching Outlook with /cleanviews or /cleanrules does nothing, the issue persists.
Launching Outlook in safe mode does not stop the problem (concluding it's not an add-in issue).
The only view mode that it impacts is Categories. None of the others (date, subject, to, from, type, etc) will exhibit this behavior. It is specifically tied to Category view.
It seems to be exacerbated by quickly switching from email to email. If I go very slow it will often take a while to trigger the jump. By clicking through emails quickly I can cause it to trigger easily.
Has anybody experienced this before and is there any solution that doesn't involve moving mail out of the inbox and using a different grouping method? I have a few users that prefer to keep some messages in their inbox and sorting by category, which pushes the categorized mail to the bottom within their own groups.