I just installed Exchange 2007 alongside a 2003 Exchange server. The mailboxes seem to be OK but the Public Store will not mount on the 2007 server. Also, users are getting the following error on the Outlook 2003 clients:
"Unable to open you default e-mail folders. Your Exchange administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance."
Ideas? I've now been up for 47 of the last 48 hours and I am fried.