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Decommission Exchange 2016 servers

Wanted to remove a couple Exchange 2016 servers in our org that had some OS corruption.  This includes the first 2016 server.  Is there a preferred method?  What should I do about the system mailboxes?

We currently have co-existence with 2010.  I've already moved the DAG copies off these servers as well as NLB connections.
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M A
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Hi billFmurray,
Recommended way is to recover the server and decommission. Uninstall Exchange 2016 from Programs.
https://practical365.com/exchange-server/recovering-a-failed-exchange-server-2016-server/

If your server is a member of DAG please follow this.
https://practical365.com/exchange-server/recovering-a-failed-exchange-2016-database-availability-group-member/
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The server is actually up and running.  We had some issues with installing the latest CU at one point.  We finally got it up with MS support.  However we don't trust that image for any new updates so we just want to remove the servers.  We don't have any users on them besides any default/system mailboxes
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quick followup.

I ran this and i see that there are multiple arbitration mailboxes.  (I don't see any on other 2016 servers btw.)
Are these 4 mailboxes all to be moved to another 2016 server?

[PS] C:\Windows\system32>get-mailbox -arbitration -server vaex01

Name                      Alias                ServerName       ProhibitSendQuota
----                      -----                ----------       -----------------
SystemMailbox{bb558c35... SystemMailbox{bb5... vaex01           Unlimited
Migration.8f3e7716-201... Migration.8f3e771... vaex01           300 MB (314,572,800 bytes)
SystemMailbox{D0E409A0... SystemMailbox{D0E... vaex01           Unlimited
SystemMailbox{2CE34405... SystemMailbox{2CE... vaex01           Unlimited
-->Are these 4 mailboxes all to be moved to another 2016 server?
yes
thanks!