I got the Cert through the OWA on my PC and transferred it to the Pre by USB. It seemed installed just fine, but I am still having the same problem.

When I try to add the account using the manual setup, using "mail.[server domain] as the incoming mail server, after a long delay I get this error:
Unable to sign in
unable to validate incoming mail server settings

If I use the IP address for the mail server, almost immediately I get this error:
Cannot connect to Exchange Server
The server's security certificate is invalid, or your date and time is set incorrectly.

My date and time are correct (from sprint).

Do you think this is a cert problem or is a hard reset in my future?

As I said before, it used to work perfectly until they did some maintenece on the server and I tried to send mail and got a cettificate validation error.

Thank you.