We have a Windows 2008R2 SBS box that used to run Exchange. We have since moved to Hosted Exchange several years ago. Just in the last 6 months, we have been getting login popups when we are in Outlook asking us to enter our username and password. It says "Microsoft Outlook. Connecting to firstname.lastname@example.org."
The problem will only happen with a machine that is connected to our local network. If we try to connect the user on a machine outside of our building, the issue will not occur. The second part of the connection; "mex06.emailsrvr.com" is an address for Rackspace which we use but they say they cannot help us because the issue does not occur outside of our network. Secondly, the user "pfmbx01" is not a user we have.
Outlook will connect properly with the users username and password to autodiscover and work fine but we still get this other popup that comes up several times a day. It doesn't change the connectivity of Outlook; in fact, Outlook works fine when you push cancel or if you put your email username and password in the login box. It doesn't seem to matter.
We have worked many different angles on this problem but cannot seem to find a solution.
This one is a difficult one but an issue that is causing lots of frustration.