Outlook 2007 clients receiving error message about an expired certificate. I used Management Shell to create a new valid certificate and then proceeded to delete the invalid one. Great but now OWA does not work anymore. I get a message saying Internet Explorer can not display the page. Also the MAC users can not connect to their mailboxes anymore. Says Mailbox is disconnected. Please help. I don't know where to go from here. Stand alone Windows 2003 server with Exchange 2007. I read somewhere that it might have to do with IIS and that I will have to renew certificate there too but I don't know how to do that. Thank you in advance.