Outlook/Exchange Moving Messages to Rogue "Junk" Folder

I have an Exchange 2010 user that has a weird problem with their email. When new email arrives, it sits in the Inbox for anywhere from a few seconds to a few minutes and then gets moved to a folder called "Junk". This is not the default "Junk E-Mail" folder, but a new folder. If you move everything back into the Inbox and permanently delete this "Junk" folder, it gets recreated when a new email arrives. There are no rules setup on the mailbox.

This is happening both in Outlook and Outlook Web Access. I've run a full virus scan on the PC and run a repair on the Exchange mailbox. Does anyone have any clue what this could be and how to stop it?
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
That is almost certainly a third party app doing it. AV, Antispam, something like that.
The folder is created on Outlook and that is replicated back to the Exchange server (hence you are seeing it in OWA).
Has the user accessed their email from another machine at all? Perhaps at home which doesn't have the same product that you do?

leatherleafAuthor Commented:
I'm thinking it might be his phone. We had him delete the account from his phone last night and we'll see how Outlook behaves today.
SsbMsConnect With a Mentor Commented:
Also check if any latest patch applied for outlook/IE.
leatherleafAuthor Commented:
Problem was a known glitch with the Samsung Galaxy S4 phone. Following the steps outlined in this forum fixed the problem:

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