If a server or user fails to migrate to OCS 2007 you can still move the organization back
to LCS 2005. With limited or no impact to users, you can perform a side-by-side migration
to OCS 2007 without shutting down total services to the organization.
Once you have migrated the users from LCS 2005 to OCS 2007, you can add new
features of OCS 2007 such as Web conferencing, VoIP telephony, and multipoint video
conferencing. The migration from LCS 2005 to OCS 2007 is one of the easier migrations
among the Microsoft Windows server system migrations.
Solutions Fast Track
Understanding the Migration
from LCS 2005 to OCS 2007
?› You cannot upgrade client software from MOC 2005 to MOC 2007 until after the
user has been migrated from LCS 2005 to OCS 2007.
?› You cannot activate enhanced presence until the client has been migrated to OCS 2007
and is using the MOC 2007 client software.
?› Choose the ???big bang??? method of migration from LCS 2005 to OCS 2007 to
minimize the need to run both an LCS 2005 and an OCS 2007 environment in
parallel for an extensive period of time.
Planning Your Migration from LCS 2005 to OCS 2007
?› Identify the locations of all existing LCS 2005 servers so that you can make sure
you migrate all servers to OCS 2007 in your environment.
?› Know the server roles of all LCS 2005 servers so that you can properly map a
migration of those servers and roles to OCS 2007 in the right sequence.
360 Chapter 11 ??? Upgrading to Offi ce Communications Server 2007
?› Map the routing of communications between servers so that server-to-server
communications is set up properly between systems in the new OCS 2007
environment.
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