Upgrading From Exchange 2000 to Exchange 2010

Are you or anyone you know still running Exchange 2000? If so, you should
know that when you do finally get around to upgrading; Exchange 2010 and
Exchange 2000 cannot exist in the same Forest/Org. The oldest version of
Exchange that can co-exist with Exchange 2010 is Exchange 2003 SP2.

If you want to upgrade from Exchange 2000, you’ll have to upgrade in stages.
Because Exchange 2000 supports an in-place upgrade to Exchange 2003, this method
is going to be the easiest way to prepare for Exchange 2010. Exchange 2003
requires more resources than Exchange 2000, but for the purpose of a migration
project; it won’t be around for long anyway, so you might be able to upgrade
resources in place. Otherwise, you’ll have to allocate hardware for Exchange
2003 only to get rid of it when you go to Exchange 2010. If you are forced to
take this approach, I would recommend virtual hardware for Exchange 2003 as it
is now supported.

We can get into detailed guidance another time, but here are some scenarios
for upgrading to Exchange 2010 from an earlier version of Exchange. I am not
including Exchange 5.5 in this post because I hope nobody is still running it!
Also for the below guidance, I am assuming everything is running the latest
Exchange service pack and/or rollup.

Current Platform* Getting to Exchange 2010
· Exchange 2000· On Win 2000

· With 2000 AD

1. Do an in-place upgrade to Exchange 20032. Don’t bother upgrading the Operating System

3. Prepare for an AD 2003 upgrade (scenario 2)

4. Do an in-place upgrade of at least one domain controller to AD 2003

5. Migrate
from Exchange 2003 to Exchange 2010

[UPDATE – NOTE THAT THIS REQUIRES ADDITIONAL CHANGES IN ACTIVE DIRECTORY.  THE STEPS IN THIS ARTICLE ARE TO GET YOU TO EXCHANGE 2003 ONLY.  THE HYPERLINK HERE INCLUDES THE REMAINING STEPS.]

· Exchange 2000· On Win 2003

· With 2000 AD

· How did you get here? This is not a supported configuration!
· Exchange 2000· On Win 2000

· With 2003 AD

1. Did you first prepare for mangled attributes? If not, examine scenario 3.2. Do an in-place upgrade to Exchange 2003

3. Migrate
from Exchange 2003 to Exchange 2010

[UPDATE – NOTE THAT THIS REQUIRES ADDITIONAL CHANGES IN ACTIVE DIRECTORY.  THE STEPS IN THIS ARTICLE ARE TO GET YOU TO EXCHANGE 2003 ONLY.  THE HYPERLINK HERE INCLUDES THE REMAINING STEPS.]

· Exchange 2000· On Win 2003

· With 2003 AD

· How did you get here? This is not a supported configuration!

*When I list an AD version, I am also assuming /forestprep has not yet been run for a future version of AD.