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I have walked into a situation where my new company is wants to upgrade to Lync 2013 Enterprise from OCS 2007 R2. My main area of concern is the SIP domain. The primary SIP domain (sip.123.com) is what OCS and Exchange 2010 uses; currently Lync 2013 is using the same SIP domain but only has a Front End deployed. I am trying to figure out the best process to bring up a Lync Edge server all using the same SIP domain (for a few months) I would like for the Lync users to enjoy mobility services and have it set up in advance for when I add the remainder of OCS client into Lync. <br />
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I prefer to stay away from having to use our secondary SIP domain (sip.456.com) as I want to utilize the full features with Exchange 2010 in Lync.
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I have walked into a situation where my new company is wants to upgrade to Lync 2013 Enterprise from OCS 2007 R2. My main area of concern is the SIP domain. The primary SIP domain (sip.123.com) is what OCS and Exchange 2010 uses; currently Lync 2013 is using the same SIP domain but only has a Front End deployed. I am trying to figure out the best process to bring up a Lync Edge server all using the same SIP domain (for a few months) I would like for the Lync users to enjoy mobility services and have it set up in advance for when I add the remainder of OCS client into Lync. 

I prefer to stay away from having to use our secondary SIP domain (sip.456.com) as I want to utilize the full features with Exchange 2010 in Lync.

Lync 2013 and OCS co-exist using same SIP address

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Instant messaging (IM) is a type of online chat that offers real-time text transmission over the Internet. A LAN messenger operates in a similar way over a local area network. More advanced instant messaging can add file transfer, clickable hyperlinks, Voice over IP, or video chat. Non-IM types of chat include multicast transmission, usually referred to as "chat rooms". Depending on the IM protocol, the technical architecture can be peer-to-peer (direct point-to-point transmission) or client-server (a central server retransmits messages from the sender to the communication device).

Chat / IM

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.