Moving exchange mailboxes

My guess is that your best bet is through the backup system. However, I am more intrested in the answers.

Transfer all the files to backup and transfer the over to company 1,Replication will not be an option considering tme it would take for setup.
Exporting these files will take considerable time to run a script.

I would backup the Private and Public Information Stores to tape. This will take a few hours (depending on the size), but is the best option.

use the msexchange move server wizard. you could also try the latest version of exmerge to move all mail boxes to a pst then inport inot your new server.

You can use Migrate.exe From Back Office 4.5 resource Kit to migrate mailboxes. To install the Mailbox Migration tool
Create a subdirectory called MBMigrate (for example, in the main Windows directory Winnt).
From the i386\Exchange\Migrate\MBMig directory on the Microsoft BackOffice 4.5 Resource Kit, compact disc, copy the Migrate.exe, Sample.csv, and MBReply.txt files to the newly created MBMigrate directory on your computer.
Verify that the Dapi.dll, Exchmem.dll, and Libxds.dll filesare installed in your Windows\System32 directory. If they are not there, copy Dapi.dll from the i386\Exchange\Migrate\MBMig directory, and copy Exchmem.dll and Libxds.dll from the i386\Setup\Libs directory on the Microsoft BackOffice 4.5 Resource Kit, compact disc.

Dmitri

Your best bet is to use the Move Server wizard that comes with the Back Office resource kit. You will need a workstation logged in as the service account and that has access to both servers. The wizard will let you copy each mailbox down to a .pstfile and then back up to a mailbox on the new server.
Or, you can manually connect to each mailbox and move/copy all mail down to a .pst file and then up to the new server.
Check out this MS technote:
http://www.microsoft.com/TechNet/exchange/technote/moveuser.asp

- Steve

I think the best way is to use the backup/restore mechanisms.

First do a complete full BUP with bricks level, so you can restore based on individual mailbox.

Prepare the second Exchange SVR with different name but same site & Org. Do a individual mailbox restore. Check with this Article Q146920 for more info/guide.