my work has changed its server address temporarily due to a new server being configured.

Basically the beginning of the server address has changed from "server." to "server2." and I can no longer connect to my exchange account with my N900

when configuring the settings it says the Certificate is invalid , if this is a trusted server click ignore. After pressing ignore I get a message stating "Either exchange server requires secure connection or account is disabled"

my handset was working fine before the server moved to "server2."

Any Idea on how to resolve this