We have just completed a staged migration from a single Exchange 2003 Server to Exchange Online (Office 365) using the guide, "Perform a Staged Migration of email to Office 365."
At the end of the guide, Microsoft warns: Decommissioning Exchange can have unintended consequences. Before decommissioning your on-premises Exchange organization, we recommend that you contact Microsoft Support.
The following have been accomplished so far:
- All on-prem mailboxes have migrated successfully.
- All on-prem users have been converted to mail-enabled users.
- Their mailboxes no longer exist in Exchange 2003, as part of the conversion to MEUs.
- DirSync is used to synch AD up to Office 365.
We plan to:
- Decommission Exchange Server 2003.
- Upgrade domain controllers from Windows Server 2003 SP2 to 2012 R2.
Since Exchange 2003 doesn't work in 2012 DFL/FFL, it most likely isn't possible to use any 2003 management tools to edit ADUC.
In this scenario, would you recommend to simply uninstall Exchange 2003?
Thanks!
- Edited by AMSYS Sunday, May 17, 2015 2:44 PM
- Moved by Jason Johnston [MSFT]Microsoft employee 17 hours 1 minutes ago Not a development question.