Two weeks ago our company was contracted to migrate a single Windows 2003 server (file & Exchange 2003) to a new single Windows 2008 server (file & Exchange 2010).
The 2K8 server was added to the domain as a DC & GC, shares were recreated, files were moved over, all without issue.
Exchange 2010 was installed, mailboxes were moved, and OWA works. After decommissioning the old server, mail processing stopped, OWA broke, and Outlook 2007 users were no longer able to connect, so we reestablished it as a DC & GC.
As luck would have it, the old server started shutting itself off during the workday (not hibernation, just turning off), so we left it turned off and were forced to remove all traces of it from AD now stored on the new server. No traces of it appear in ADD&T, ADU&C, ADS&S, DNS, or DHCP.
Email flow has resumed without a hiccup since the weekend, OWA works, but Outlook still won't connect, claiming "Cannot open your default e-mail folders. Microsoft Exchange is not available. Either there are network problems or the Exchange computer is down for maintenance."
We suspect this error has something to do with a setting that relates to the old server still being necessary for either Exchange or Outlook, but we can't find it.
What information can we provide to you to help diagnose this issue?
Thank you in advance,