The question
is whether the two environments will coexist for a short period specifi cally to migrate users
from one environment to the other, or whether the coexistence will last for a lengthy period.
The choice is a matter of feasibility and comfort factor in terms of performing the cutover.
Upgrading to Office Communications Server 2007 ??? Chapter 11 331
Feasibility of a Short Coexistence Time Frame
It is unlikely that an organization with dozens of LCS 2005 servers spread around the world
will be able to migrate all of its servers and potentially hundreds or thousands of its users all
at once. The reality that it ???just takes time??? to get around to a large number of users dictates
that a long coexistence will likely occur for this organization??™s migration process. However,
an organization with a single server and, say, 50 users could have a short coexistence time
frame, and could migrate entirely from LCS 2005 to OCS 2007 in an evening or a weekend.
Comfort Factor of a Long Coexistence Time Frame
Even organizations with a limited number of servers that could migrate from LCS 2005 to
OCS 2007 in a short period may choose to migrate over a long period, methodically putting in
new OCS 2007 servers and testing all aspects of the new installation before migrating users to
the new environment, and most certainly before decommissioning an older LCS 2005 server.
Choosing a Coexistence
Time Frame That Works for You
Fortunately for you, nothing is forcing you to migrate slowly or quickly; that decision is
entirely up to you.
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