I've have problems with an Exchange 2003 Server and OWA. When using Outlook Web Access, I cannot open emails that has a period (.) last in the subject line. It seems as if Internet Explorer thinks the filename ends after the period. Let's say I get an email with the subject line "Hello World.". I get the 401 error when trying to open it. I can open emails with a period in the middle though, like "Hello.World!" The problem only occurs when the period is at the end of the subject line. I can open the email in the regular Outlook client with no problems. Has anyone else experienced this problem?
The server has SP1 installed by the way and the OS is Windows 2003 Server. OWA is published through an ISA 2000 Server.