1st January 2007: I have tried to logon to my Lotus Notes client ans suddenly have a message “Server Error: Your certificate has expired”.
If I try to logon to the Admin client, I get the same.
Can anyone help? Obviously, this is urgent for me.
Subject: Server Error: Your certificate has expired
On the other hand, this is no longer an issue for me. For some reason, the Win 2003 Domino server time reset itself to 1999 at 08:53 am this morning and I could not reset it so I rebooted the server and all is now restored back to normal.
Phew, and users didn’t even notice 
Subject: RE: Server Error: Your certificate has expired
… didn’t notice YET.
Any documents created/modified since the time got messed up will have bogus time-stamps.