I have about 15 or so folders 'under' my inbox and have rules to forward incoming emails into the appropriate folder. Randomly when opening, deleting, or checking for new email the folders just disappear - blink - they're gone. The inbox is still there but all of the sub-folders are gone. If I close Outlook and reopen it all the folders are back, including the enclosed emails until the next random event occurs.

This was happening with Mavericks and I recently upgraded to Yosemite and I have also upgraded to the newest version of Office for Mac (14.4.5). I have repaired my Main Identity and also deleted all Outlook preference files. 

NOTHING has fixed it.

Now what do I do? I don't really want to go to OS X Mail but I also fear one of these times my folders won't return when I reopen Outlook.

Thanks!