All mailboxes have been moved from Exchange 2007 to Exchange 2013 and were working. We wanted to turn off the Exchange 2007 server to see what would happen before we uninstall Exchange 2007. The help desk lit up with calls concerning a proxy server security certificate error and Outlook 2010 connectivity issues. We turned on the Exchange 2007 server and the errors went away. I was hoping that removing the public folder database would solve the problem. We did not migrate the public folders because we do not want them. All the public folders were deleted. An attempt to remove the database resulted in "Object is read only because it was created by a future version of Exchange." After much research, decided the only way to get rid of it was ADSIEdit. Immediately after removing the public folder database, Outlook 2010 users intermittently get "There is a problem with the proxy server's security certificate. The name on the security certificate is invalid or does not match the name of the target site mail2.contesso.com. Outlook is unable to connect to the proxy server. (Error code 0)". I assure you the certificate matches the name of the 2013 server FQDN exactly. My theory is these clients are looking for the public folders. Any idea how to correct this before the users arrive for work in the morning?
Tina M. White Boundless Data