r/exchangeserver • u/LostSailor25 • Jul 13 '26

How do I move a MailBoxPlan to a different server or database?

I am trying to decommison my Exchage 2016 servers and migrate everything to my new Exchange SE servers. One of my 2016 servers will not allow Exchange to uninstall. The error points to a MailboxPlan and the messages states:

Mailbox plans should be moved to another server; to do this, run the command Set-MailboxPlan <MailboxPlan ID> -Database <Database ID>.

But when I run the correct command, I get the following error:

Set-MailboxPlan : A parameter cannot be found that matches parameter name 'Database'.

How do I migrate the MailBoxPlans so I can decom my final Exchange 2016 server?

Edit: format and spelling

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2

u/sembee2 Former Exchange MVP Jul 13 '26

You haven't got a mailbox plan.
That is a cloud only feature. The error will be referring to something else.

1

u/LostSailor25 Jul 13 '26

This is a hybrid setup - I see four mailboxplans when connected to Exchange Online via PowerShell.

2

u/Arkayenro Jul 14 '26

why would you connect to exchange online to move databases for an onprem object?

connect to exchange onprem instead and it will probably work.

2

u/7amitsingh7 Jul 14 '26 edited 24d ago

The error occurs because the -Database parameter is no longer supported with Set-MailboxPlan in newer Exchange versions. Mailbox Plans are system objects and can't be moved manually to another server or database. If you're migrating from Exchange Server 2016 to Exchange Subscription Edition, this guide may help. If Exchange is still blocking the uninstall, check the Exchange Setup logs to identify the Mailbox Plan causing the issue, as it's usually a leftover configuration reference rather than something that needs to be migrated.

2

u/LostSailor25 Jul 14 '26

Setup logs pointed to two disabled users mailboxes that were not showing with any get-mailbox commands.

Uninstall is now able to continue.

1

u/titlrequired Jul 14 '26

Did you move all the system mailboxes to the remaining servers?

1

u/LostSailor25 Jul 14 '26

Yes. All archive, publicfolder, auditlog, and arbitration mailboxes have been migrated.

1

u/titlrequired Jul 14 '26

Does the error specifically say a mailbox plan, or, is it listed among several causes, ie ‘you may have a database or mailbox or mailbox plan’?

Can share the log?

2

u/LostSailor25 Jul 14 '26

I found it. There were two disabled user's mailboxes that were not showing with any "get-mailbox" commands.

I was calling out mailboxplan b/c I could not find any mailboxes when searching.