Also, you don??™t have to extensively test the crosscommunication
between the LCS 2005 servers and the OCS 2007 servers. Once you add
the new OCS 2007 servers and migrate the user information to them, you can give the new
servers the same IP address as the old servers and users can launch their client software and
access the OCS 2007 environment without even knowing the environment was upgraded.
Performing a Phased Migration to OCS 2007
If your organization has dozens of LCS 2005 servers around the world, it likely won??™t be
feasible to get to all of the servers and the hundreds, if not thousands, of client systems to
upgrade all users simultaneously. In the phased migration, your organization would typically
migrate server by server and site by site in an orderly and timely manner. Specifi c users will be
migrated from LCS 2005 to OCS 2007 in groups. The groups will typically reside on specifi c
servers. And servers within one site will be migrated before you move on to the next site.
A key to performing a phased migration is that you cannot easily enable certain features
that are available in OCS 2007 (such as one-to-many video conferencing or Voice over IP
[VoIP] telephony) until all users in the organization have been upgraded to OCS 2007. You
can have some users have these new features and other users not have these features; however,
users become confused when they can videoconference and have telephony conversations
with some users and not with others.
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