today i have a problem when connecting with a Macintosh Client and Outlook or Mail for MAC to an Exchange 2007 (OWA) server through McAfee MWG. There is always an error 500 reported from IIS.
The same client and the same Microsoft OWA server are working fine with an Microsoft ISA Server. There is a special setting done on ISA, but i don´t know what will be changed with this setting.
The MAC Client is also working fine when directly connecting to the Exchange Server.
Perhaps someone has a hint for me.