I've just taken over a server after a company fired their IT guy and I'm trying to get them sorted out & figure out what's been going on there. I'm having multiple issues. I'm having a problem with users unable to use Outlook over http. It just keeps asking for a username and password, no matter what you put in there, it doesn't work. In troubleshooting, I tried to set up a new user's outlook over the internet and it doesn't want to conenct to the server mail.xxxx.com either. Testexchangeconnectivity.com fails with SSL errors and the event log contains the following error: "Microsoft Exchange couldn't find a certificate that contains the domain name xxxSERVER1.csc.local in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector Default xxxSERVER1 with a FQDN parameter of xxxSERVER1.csc.local. If the connector's FQDN is not specified, the computer's FQDN is used. Verify the connector configuration and the installed certificates to make sure that there is a certificate with a domain name for that FQDN. If this certificate exists, run Enable-ExchangeCertificate -Services SMTP to make sure that the Microsoft Exchange Transport service has access to the certificate key." Alos, if I open up Certificate Manager in mmc, it shows my cert under "Personal" (I thought it should be in Trusted Root CA) and under Certification Path it says "This certificate has been deactivated". I've verified with Godaddy that the cert is good until 2014. Any help would be MUCH appreciated. This is a very busy office and I can only reboot the servers maybe once a week if I need to. So I'm hoping I can fix this mess without a reboot, or get everything lined up for one reboot. Thanks