
The fix
OK - this only works if you haven't messed with everything else and assumes standard setup....
Simply:
Make sure Outlook isn't running
Control Panel
Email Accounts
Double-click on the Microsoft Exchange account
More Settings
Connection
Exchange Proxy Settings
then change the 2 ".co.uk"s to ".com"s
Then ok everything
Just restart Outlook and make sure the username hasn't been changed, then type in the password and all should be fine.