So I have an exchange 2007 server setup on SBS2008 which has been functioning for some time.
I have 2 laptops with the following issue in outlook 2010.
When I configure the server in outlook 2010, my SMTP server is mail.xxx.xxx externally.
This works while they are outside the building.
When they come into the building, or it is configured inside the building, the SMTP server is changed to the SBS2008 FQDN, even if I erase it, and try again, or completely reconfigure outlook 2010.
This is an issue for laptop users, and I have more laptop users coming in soon.
I thought it might be a DNS issue, so I tried to create a record manually in DNS to resolve the issue pointing mail.xxx.xxx to the internal IP address, and it did not help.