We have a Client who we are in the process of moving from a simple hosted exchange solution through Microsoftonline.com to a local exchange 2010 server. Since it is only 5 users with very small mailboxes we are going the "easy" route and simply changing the MX records and creating new profiles on their outlook clients. They were using the microsoft single sign on tool to auto configure their outlook before, i started by uninstalling this.
Before deleting the old profile i exported her mailbox to a pst file. I then created a new profile and had it connect to the local exchange. I have tried letting autodiscover do the work for me (and it fills in the fields correctly) and manually entered the servers local address.
After opening outlook with this new profile it connects to the server ok (i can confirm this on both ends), but after about 10 seconds it prompts for the login credentials for "red001.mail.microsoftonline.com". I have ensured there is NOTHING in the profile pointing to this, as well i know the single sign on tool is not installed anymore. I have cleared local DNS caches as well as the servers DNS cache and ensured nothing is out of the ordinary in DNS.
I tried Ccleaner to clear up registry crap, but no change.
The user also uses business contact manager so i thought it might be interfacing with the server, so i removed that software as well, same problem.
Now even if i do not authenticate and click cancel, i get a "Needs Password", but i still get email through the local exchange, can send and receive ok.
I am at a loss as to where to go from here, we need to get rid of this message. Any ideas?