I'm in the process of upgrading from Exchange 2010 to 2 Exchange 2013 servers. I've created my mailboxes and Database availability group on the new servers and all statues are healthy. I've imported my wildcard certificate from my old server to the both 2013 servers and enabled IIS and SMTP to use this certificate. I've created a couple of test accounts to test mail flow, and mail flow is working between all three servers. One thing I'm having an issue with is connectivity with Outlook clients (2010 and 2013). I receive certificate errors and proxy server errors. It is my understanding that Microsoft is now using only "Outlook Anywhere" for all connectivity between the server and the client with Exchange version 2013. I checked the exchange proxy settings on one of the Outlook clients and noticed the MSSTD setting is not configured properly. Its supposed to have the wildcard certificate in the MSSTD field but instead it has mail.domain.com. After doing some research, there's a command that you use in exchange power shell to make changes to the OUTLOOK PROVIDER. But I'm afraid this will affect the old exchange server as well. I'm trying to make this a smooth transition, and avoid creating problems for users. Does anyone have recommended steps on how to proceed from this point?
Thank you for your time.