Can't get rid of a autodiscover certificate popup in Outlook 2010

I have a Windows 7 Pro 64bit machine running Outlook 2010. We recently started getting a Windows Security box for Outlook that comes up that says, "Connecting to (email@server.com)" and asks for our username and password.
The interesting thing is that the email that is listed in the box is not part of our domain and it doesn't let us change it. If we cancel it, we are still connected to exchange. The box seems to be arbitrary to our actual connection.

My thought is that someone accepted a security certificate at one time without reading it and now it keeps coming back up. I would like to go into the certificate store and see if I can find something that matches so I can delete it. I just don't know where the certificate stores are. Can anyone help?
TcAnthonyAsked:
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becraigConnect With a Mentor Commented:
I would urge caution here before deletion any certificates.

You need to load mmc.exe then add remove snapins - certificates - (you will do this twice first select local computer, then current user)

You can then identify the certificate in question.  


However what makes you sure this is a local certificate issue ?

It sounds like something else to me.
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TcAnthonyAuthor Commented:
Your caution is noted and appreciated. The reason I think it is local is if I create a new profile on the same machine, it asks to authenticate again. If I create a profile on a different machine, it doesn't. It seems to be machine specific.
Now here is a little more info I just discovered and some more background info.
This is a hosted exchange service we are using. We recently migrated from Exchange 2007 to Exchange 2013. The mailbox it is trying to authenticate is pfmbx01@"servername".com.
From what I read, pfmbx01 is a "public folder mailbox" used for migration. Our host company has not gotten back with me but I suspect it may have something to do with the migration.
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becraigCommented:
Sorry for the delayed response:

Can you provide the exact error the user gets in the pop-up ?

It would help in providing a solution..
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