Exchange 2010 – Bulk Mailbox Migration In Batches

Update:
I created a new version of this script here
I recently completed a project that involved migrating Exchange 2010 Mailbox role from a standalone server to a Database Availability Group, or DAG. This was a large project that took a lot of time and planning, and had the potential to be very tedious. Fortunately, with a little knowhow, you can automate many of the tedious tasks.

I wanted to be in full control of mailbox migration, so my requirements were fairly strict:

  • Don’t just submit all mailbox move requests en masse
  • Submit move requests in “Suspended” status, so that I can manually release them at a later time
  • Move smallest mailboxes first, and progress gradually to big mailboxes
  • Chose best destination mailbox database
    • I define best as the database with the most free space.
  • Only pull mailboxes from one mailbox database at a time

The script below will accomplish these objectives.

Keep in mind, your destination mailbox database is likely named differently than mine – make sure you change it on line number 21.

I’ll post the script I use to release these suspended jobs systematically at a later date.

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