No doubt, there will be both LCS 2005 and OCS 2007 servers in your
environment because the migration process is a side-by-side migration. However, you can
keep the old LCS 2005 servers in place for a long time if you want.
Most administrators who have many servers to migrate tend to start conservatively in
that they leave the old LCS 2005 environment running for a lengthy period after they have
implemented OCS 2007. However, over time, these administrators become more comfortable
with the migration process and tend to drop the LCS 2005 systems off the network soon after
they have an OCS 2007 replacement server in place.
The only real decision to make is to not drop the old LCS 2005 server if users still depend
on it to access their IM and communications services, or if it is being used to route messages
or communications for the environment. You should decommission the server only when
the organization truly is no longer using it. I will cover how to validate that your LCS 2005
server is no longer being used before you remove it in the ???Removing LCS 2005 from the
Network Environment??? section later in this chapter.
Choosing the Migration
Path from LCS 2005 to OCS 2007
If you decided on a short coexistence migration path from LCS 2005 to OCS 2007, you can
take the ???big bang??? approach for migration. If you decided on the long coexistence migration
path, you can follow a phased migration approach.
332 Chapter 11 ??? Upgrading to Offi ce Communications Server 2007
Performing a ???Big Bang??? Migration to OCS 2007
With a ???big bang??? migration, you migrate the entire organization from LCS 2005 to OCS 2007
all at once; as such, you don??™t have to worry that some people will be using LCS 2005
and others will be using OCS 2007.
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