<div>
<div class="content wysiwyg-content">
We are migrating our Exchange Infrastructure from 2003 to 2010 and our Communications Infrastructure from Live Communications Server 2005 to Lync 2010, in a phased approach.<br />
<br />
We would like to start our phased approach with installing Exchange 2010 in a Co-Existing Environment and moving some mailboxes over to the 2010 Server.<br />
<br />
I'd like to know if this will cause any danger to our Communications Server 2005 setup. We will not be running Unified Messaging and we are not using the availability status in Outlook at the moment, but IM functionality will still need to be available while we are phasing over to Exchange 2010.<br />
<br />
Once Exchange 2010 has been implemented successfully and we have moved all the mailboxes accross, we will start with the co-existence of Communications Server 2005 - 2007 and then to Lync 2010.<br />
<br />
So in short..... Will IM still be available on Communications server 2005 after installing an exchange 2010 server to co-exist in a current 2003 environment?<br />
<br />
The Schema and Forest is at the 2003 level.
</div>
</div>


We are migrating our Exchange Infrastructure from 2003 to 2010 and our Communications Infrastructure from Live Communications Server 2005 to Lync 2010, in a phased approach.

We would like to start our phased approach with installing Exchange 2010 in a Co-Existing Environment and moving some mailboxes over to the 2010 Server.

I'd like to know if this will cause any danger to our Communications Server 2005 setup. We will not be running Unified Messaging and we are not using the availability status in Outlook at the moment, but IM functionality will still need to be available while we are phasing over to Exchange 2010.

Once Exchange 2010 has been implemented successfully and we have moved all the mailboxes accross, we will start with the co-existence of Communications Server 2005 - 2007 and then to Lync 2010.

So in short..... Will IM still be available on Communications server 2005 after installing an exchange 2010 server to co-exist in a current 2003 environment?

The Schema and Forest is at the 2003 level.

Live Communications Server 2005 to Lync 2010 and Exchange 2003 to 2010 phased approach

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.

Exchange

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).