If it were that simple, I wouldn??™t have anything to write
about in this chapter. Because the path for migration is well defi ned and has little fl exibility,
following the procedures outlined in this chapter will ensure a successful migration from
LCS 2005 to OCS 2007.
Understanding the
Migration from LCS 2005 to OCS 2007
To migrate from LCS 2005 to OCS 2007 you must follow a specifi c sequence of steps.
Understanding this sequence is important. For example, if you upgrade an existing Microsoft
Offi ce Communicator (MOC) client to the new 2007 edition, the user will not be able to
access LCS 2005 because MOC 2007 is incompatible with LCS 2005. Similarly, if you move
a user to OCS 2007 and enable enhanced presence for that user, he won??™t be able to access
his account with the old MOC 2005 client software because enhanced presence requires the
MOC 2007 client.
As I??™ve mentioned, planning and then executing a migration from LCS 2005 to OCS 2007
requires specifi c steps that you need to follow in a prescribed order. The fi rst step is to plan
for the migration and make sure you have the proper sequence for migration, that you??™ve
performed all prerequisites before migrating, and that you enable features at the right time so
that you don??™t get ahead of yourself during the migration process.
Understanding the
Coexistence of LCS 2005 and OCS 2007
When you are upgrading from LCS 2005 to OCS 2007, because there is no in-place upgrade
that will allow you to simply insert a CD into a server and upgrade a system all at once, LCS
2005 servers and OCS 2007 servers will coexist in your environment at some point.
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