We have just completed a migration from Exchange 2003 to Exchange 2010. The server is an on-premise single server solution with a mix of Outlook 2003 & Outlook 2010 clients. The server name is exchange.companyname.local and we have installed a GoDaddy SSL certificate in the name of office.companyname.co.uk which is the external name, this is assigned in IIS and currently works with Outlook We App with no problems. The problem we are experiencing is that on the Outlook 2010 clients an SSL error keeps being displayed saying 'The name on the certificate does not match the server'. I'm guessing there’s some additional configuration required somewhere since we installed the GoDaddy certificate. Help would be very much appreciated. Thanks in advance.