I have many SBS 2003 installs and Outlook RPC over HTTPS has worked flawslessly for years on many different client systems (XP, Vista and Win 7). Recently the Win 7 SP1 machines cannot connect with the credintals prompt. I have the cert installed and do not get the SSL warning on OWA or RWW. If I install XP Mode on the Windows 7 box, which I had to do to get it to work, it works OK.
I have 30 or machines (Windows 7 Home Premium, Vista and XP) all doing this only recently am I getting this problem. I know full well that getting a public cert may help, but can anyone help me understand why this happening and how to fix it?