We have a couple users still using Outlook 2003, they are frequently off site. We have setup their profiles with RPC over HTTP. (Outlook Anywhere) The problem is when they are in the building their Outlook seems to only connect via HTTPS and will not connect locally via TCP.
This causes some significant delays. Their settings have the box unchecked for "on fast networks connect with HTTP first" but as you can see by the image below it still only connects via HTTPS. The only way around this is to uncheck the Outlook over RPC options on the connections tab. Once that is done when they launch Outlook it connects via TCP fine right away.
What would cause this? We have an Exchange 2007 server. I have a feeling it's related to Outlook 2003 because anyone who uses Outlook 2007 does not have this problem.
Also their PC's are not members of the domain but that shouldn't matter should it? They are frequently offsite at customer locations and are constantly joining work groups so they do not want to be joined to the domain.