Best tool to move Exchange 2003 data to Exchange 2007 in a cross-org setup?

Nope, not in the gui cross Org moves is only command line.....

else you have to use 3rd party tools

Hold on, are they in the same Exchange organization (and therefore AD forest)?  (You can change recipient policies without moving mailboxes outside of the exchange org).

If they are in the same Exchange Org you can use the Exchange Management Console (a GUI) to move mailboxes.

Honestly though, PowerShell rocks it's worth your while to learn it ;)

Erik

What is a good 3rd party tool to use for this? I don't have enough time to learn PowerShell at this point and just need to get this done as cleanly and quickly as possible. Thank you.

I didnt say anything about a 3rd party tool, just that the Exchange Managment Console is a GUI.

You didnt answer my question, is this a single Exchange Organization or 2 seperate ones?

Take the time to learn PowerShell, I promise it will be worth your while (especially come Server 2008).

Erik

Sage mentioned a 3rd party tool so I was trying to follow up. These are 2 seperate Exchange Organizations, thank you.

You can use exmerge to export the mailboxes to PST files then import them into the other organization.

ExMerge is a 2003 only tool, he would have to import the PSTs using the Import-MailBox commandlet in the Exchange Managment Shell (which he just said he is looking to avoid).

I've never used any 3rd party tools for moving the mailboxes to Exchange 2007.

Erik

Perhaps you can help me with the Exchange Management Shell. Do you think this would be easier than ExMerge?

Yes, I think using the Move-Mailbox commandlet would be quite a bit easier than using ExMerge and than using Import-Mailbox.

Here is what looks like a good article for you, it even has the EMS commands you need to run:
http://www.buit.org/2007/01/05/the-legend-of-exchange-twilight-mail-migration/

Good Luck,
Erik

Quest software made great tools for migrations.....

I made an assumption these are 2 different org by your statement, is that true?

http://www.quest.com/intelligent-messaging/

We are going from .org to a .edu domain name. I am running into problems setting up the trust. To Microsoft our site "domain.org" is the same as "domain.edu" so when I try setting up the trust I am told that the trust is already established. The two domains are both seen as "domain" without the extension. How do I get around this?

spyordie007 I have created a temporary domain and am still working on moving over the email. Do I need to migrate the user accounts first and then move the email over?

Yes, you need to migrate the user accounts before you will be able to migrate their mailboxes.

Erik