I have an exchange 2010 server with 50 staff connected to it and all using Outlook for email. Recently, some of the clients are receiving a certificate popup on launching Outlook as well as sometimes a 'there is a problem with your servers proxy server' message at the same time.
Nothing has changed in Exchange and I have run through a microsoft kb http://support.microsoft.com/kb/940726
but this has not helped the issue.
Does anyone have any ideas??
Thanks in advance.