I have had two issues with Windows 7 so far. The first was 64 bit support for Citrix Access Gateway – delayed apparently until December or even first quarter of next year. Rather than waiting we have implemented a temporary solution in OpenVPN. This works really well, however you do need to make some changes on installation and running (mostly to do with admin privileges). It also doesn’t get around the port restrictions people face when travelling thanks to overzealous hotel firewalls. Still, it works well for us.
The second issue was weird – Windows 7 doesn’t like WEP (Wireless Encryption Protocol). That’s not really a bad thing in itself, as WEP is trivial to crack, and is strongly discouraged in practice. I was at one of the big four law firms in Auckland for a board meeting, to find that their guest network uses WEP and Windows 7 would only allow a manual add of the network. The interface for doing this is screwy, because you use a wizard initially to create the wireless profile, but if you have to change the encryption method you lose the network key hash, so you have to re-enter it. This is very frustrating when it was 25 characters long! Needless to say I have been talking to their CIO and asked them to upgrade to WPA2.