Hi,
We've been trying to get Exchange 2019 to work but have had so many problems we've decided to uninstall it and rebuild the server. It's possible something is corrupt because several cmdlets fail with odd errors and it won't accept any product keys. Before uninstalling we were going to move the system mailboxes back to Ex2013 but I'm not sure how to identify which ones are needed, maybe we should just go by created date?
Get-Mailbox -Arbitration | Select-Object Name,ServerName,RecipientTypeDetails,WhenCreated | ft Name ServerName RecipientTypeDetails WhenCreated ---- ---------- -------------------- ----------- SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c} EX2019 ArbitrationMailbox 7/6/2016 1:10:48 PM Migration.8f3e7716-2011-43e4-96b1-aba62d229136 EX2019 ArbitrationMailbox 7/6/2016 1:10:48 PM FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 EX2019 ArbitrationMailbox 3/28/2010 12:39:51 PM SystemMailbox{1f05a927-41df-4b0a-b52d-05946b02e421} EX2019 ArbitrationMailbox 3/28/2010 12:39:51 PM SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} EX2019 ArbitrationMailbox 3/28/2010 12:39:51 PM SystemMailbox{D0E409A0-AF9B-4720-92FE-AAC869B0D201} EX2019 ArbitrationMailbox 12/1/2019 4:38:05 PM SystemMailbox{2CE34405-31BE-455D-89D7-A7C7DA7A0DAA} EX2019 ArbitrationMailbox 12/1/2019 4:38:05 PM
Get-Mailbox | Select-Object Name,ServerName,RecipientTypeDetails,WhenCreated | ft Name ServerName RecipientTypeDetails WhenCreated ---- ---------- -------------------- ----------- (user mailbox details removed) extest_74aa99d50ebe4 EX2013 UserMailbox 3/31/2012 1:20:05 PM DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852} EX2019 DiscoveryMailbox 3/28/2010 12:39:51 PM
This is a dev environment, no production mailboxes. Any other advice before uninstalling Ex2019? Thanks!