Please advise on this:
We have have an internal domain xyz.lan and external domain abc.net. The exchange servers FQDN is ec1.xyz.lan and is set up to use mail.abc.net for outlook anywhere. We have a few additional accepted domains e.g def.net configured. All mailboxes have the xyz.lan domain configured by default as an alias.
Internally things work fine but we have reached the point where we need external access configured, especially for ActiveSync. Thus we are looking at getting a CA certificate. We need these different domains to work, but I'm unsure what all to include in the certificate because of the internal and external domains being different. Additionally it now seems to be a problem to register internal domains by using a CA. Can one somehow get the certificate to additionally work with Lync as well?
All advice is greatly appreciated.
