Connect Outlook to Exchange 2007 in separate domain

Question

As part of a merger, we've been asked to discontinue our Exchange 2010 email environment.  We would need to connect up our current email users (over a point to point connection with firewall in between) to the other organizations Exchange 2007 server
with completely new email accounts/addresses, via Outlook client.  I'm wondering if this is even possible.  Can our Outlook client talk to an Exchange 2007 server if Outlook exists in a native Exchange 2010 environment?

Answer 1

Yes you certainly should be able to do that. So long as you're able to connect to the remote Exchange server then you should simply be prompted for login details to access it, since obviously your local login details won't work, at which point you simply
enter the login details provided for the remote exchange server. Obviously you also need to add the remote domain before the username, eg <domain>\<username> to force it to authenticate with that domain login rather than it assuming you're logging
in using a login from your existing domain.
We've got several clients who have their mailboxes hosted on our exchange servers, most of which are running in domain environments, and in fact a few of which have old Exchange servers still running on their networks when we first set them up.