?› Understand which users are associated with which LCS 2005 systems so that you
can more easily move users to new OCS 2007 systems in the right sequence.
?› Have a strategy regarding how you will upgrade client software from MOC 2005
to MOC 2007.
Upgrading Perimeter Servers
?› Prepare DNS so that other LCS 2005 and OCS 2007 servers can properly see
perimeter servers on the network.
?› Plan for time in advance to order or request SSL certifi cates required for internal
and external communications of the LCS 2005 and OCS 2007 systems.
?› Continue to use the same external FQDN for IM communications.
?› Redirect outbound communications through a new OCS 2007 edge server before
directing inbound communications to the server system.
Upgrading Front-End Servers
and Performing User Migration
?› Add new OCS 2007 front-end servers capable of handling the demands of the
organization, including performance capabilities that are able to handle the new
features of OCS 2007.
?› Take this opportunity to consolidate LCS 2005 servers to fewer OCS 2007 systems,
because users can be migrated across servers at this time.
?› Create a test user on the new OCS 2007 front-end server and make sure the test
user can successfully communicate before moving LCS 2005 users to the new
OCS 2007 system.
?› Highlight and move users from LCS 2005 to OCS 2007 once you know the new
OCS 2007 is working properly.
Removing LCS 2005 from the Network Environment
?› Have a plan to remove LCS 2005 from the network within seven to 10 days of
completing your migration to OCS 2007.
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