Migrate from 2003 provider to inhouse 2010

[drewdown]

Trying to figure out the best way to accomplish this. Currently we have a hosted exchange (2003) and are being acquired by a company that has a 2010 exchange environment. I need to migrate users off our provider and onto the their 2010 environment.

What is the best way to do that? I can't do it all in one day. What is the best way to migrate the user data? IE current emails/contacts/calendar information?

Would this work?
1. Create mailboxes on 2010 server and forward all mail from new address to current address
2. How would I migrate user data? Mail I could move off to a PST but what about contacts and calendar information?
3. Kill forwarded from new account and forward mail from current to new
4. Once everyone is moved over update MX record to point to new company

I don't have any access to the servers from out provider, so everything for the most part would probably me manually done.

 

[drewdown]

I forgot to mention, obviously will be migrating from one domain to another. aaa.com to bbb.com but again I have no access to the physical machines of our provider..

 

[TekkieDave]

You can move all types of mailbox data off onto a PST, not just email - contacts and calendar can be exported as well.

How many users do you need to migrate?

 

[drewdown]

60 users.

I assume I should just move the data off our server via outlook on each client, then the user can decide whether he/she wants to move it back up.

 

[irbk]

I agree with TekkieDave. If your moving users into an existing Exchange 2010 environment, and it's only 60 users, export each users mailbox to a PST (assuming each mailbox is less then 2 Gig, PST's get wonky over 2 Gig sometimes). Once the PST is exported, import that PST into the new system (or just connect the client Outlook to the new 2010 server, and map the PST and leave the "old company" stuff in the PST file. Just make sure the PST can be backed up).