Communicate by using Instant Messages, Audio or Video Calls
You can send a message to contacts within your corporate network, a federatedTwo or more organizations that are linked by using Lync Server, Office Communications Server, or Live Communications Server. After you add a federated contact to your Contact List, you can communicate with the contact by using any communication mode that is available in both organizations. network, or any contact with one of the following IDs: Windows LiveAn e-mail address from any of the Windows Live services. These include all e‑mail accounts ending in "@live.com," "@hotmail.com," "@msn.com," and other accounts that are registered with Windows Live. or AOL.
Do any of the following:
Send an instant message to one person
Add more contacts to a conversation
Receive an instant message invitation
Make an audio call in Lync
Make a video call in Lync