After removing 2003 Exchange servers from 2003-2007 mixed environment Outlook 2007 fails to connect to Exchange 2007 on first attempt - "Exchange server is unavailable"
We recently removed Exchange 2003 from our mixed 2003-2007 environment. All servers are running
Exchange 2007 with SP2. All clients use Outlook 2007.
Now whenever a user opens Outlook 2007 for the first time it fails to connect with "exchange server is unavailable".
When I check the control panel > Mail applet there is a profile named "Default Outlook Profile". If I delete the
"Default Outlook Profile" and reopen Outlook it successfully connects, creating the "Outlook" profile.
It's not a showstopper, but very annoying and this behaviour just started after retiring the EXchange 2003 servers.
An nslookup of autodiscover resolves to our 2007 CAS server.
Any ideas why Outlook fails to connect to the Exchange 2007 server on the first attempt, but always
succeeds on the second attempt (after deleting the "Default Outlook Profile")