IMAP folders in Outlook 2013

Hi  - I setup a client with Rackspace mail using IMAP settings - I've had several experiences where if you're looking at outlook the number next to the junk email folder indicating how many messages are there, fluctuates constantly. You can watch it go from 204 then count it's way up to 580 and then back down to a completely different number. I did notice at the bottom it says "synchronizing junk mail" - if I go into the IMAP folder settings, and unsubscribe the junk email folder from the sync, apply the settings, exit and go back into Outlook, it does the exact same thing. Is there a fix for this or why is this happening? Any help will be appreciated.
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David Johnson, CD, MVPOwnerCommented:
Why isn't the user clearing out the junk mail folder instead of using it for storage?  With IMAP what you are seeing is what is on the server..

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