I just realized that Lync 2013 now has a very simple way of checking if a domain has federation enabled. Its just 2 simple steps:
- Type an SIP URI and open a conversation (the SIP URI can be a bogus user, the domain is all that matters)
- Now take a look if Lync shows “External Network” after “Presence unknown”, If so, this domain has external facing federation enabled at some level.
If you want to check which of your Outlook contacts have Lync federation enable, even if you don’t have Lync, your welcome to download the free Lync Who Can Federate Tool available here: http://bit.ly/wcftool
If you want to take a look at a list of the thousands of organizations that have Lync you can head over to http://bit.ly/lyncfed.