I have a few clients (notably only in the IS department) that aren't able to connect to Exchange 2010 with Outlook 2010 over our PPTP VPN connection, citing that Exchange is unavailable. This is true whether using an existing profile or attempting to create a new one. OWA functions fine and I can ping the mailserver by hostname, FQDN and IP address. There is a hosts file on all PCs and I have confirmed that they contain the exact same entries on the two PCs I'm testing this on.
It appears to be an issue with a few PCs as I have tested this with some other laptops and haven't had any issues.
I have double-checked the VPN configuration on my main PC (which, when connected to our guest wifi and VPNs in, will not connect to Exchange via Outlook) and on a test laptop (which will connect to Exchange in the same circumstances) but I'm not sure what other settings I should be looking at... Something in the way the Outlook client is configured?
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