Decomission of an old Exchange 2013 server
Hello everyone. I have a messy situation here. We contracted a small IT company to help us migrate from Ex2007 to Ex2019. I trusted them because they said they'd had experience upgrading Exchange. First they moved it to intermediary Ex2013 (named MAIL) and then finally to Ex2019 (named EMS01). Now, the server works okay for the most part, but I decided to read up on this topic and realized they had completely failed to decommission the Ex2007 properly. They just told me to remove it from AD which I did. On top of that they gave the Ex2019 the same name as Ex2007. So that’s not good and I probably will have to deal with that at some point. For now I’m faced with the problem of decommissioning the Ex2013 (MAIL) but I definitely don't want to go to those guys again (and I'm very reluctant to trust anyone else to do the job at this point). So I decided it might be better to do it myself with a lot of help from this great community. I went through https://setup.microsoft.com/exchange/deployment-assistant and also this article from Exchange Team blog and performed some of the checks before decommissioning and right from the get go I have some problems indicating that those guys didn’t do a great job at migrating either. Things I’ve noticed: In 'migration' there are a couple of batches that have errors: one is a mailbox of the admin account that was used to move Exchange and the other is arbitration mailbox. Running Remove-MigrationBatch with -WhatIf parameter doesn’t return any errors though. In Ex2019 EAC there are two servers listed and two DBs (actually three, there’s also a dismounted DB with a non-descriptive name). The old server still had it’s own Autodiscover URI, I deleted it. MAIL is still listed in our internal DNS. There was also an (A) record in our external DNS, I removed it. Clients still look for OAB on the old server. Here are the checks I did (slightly redacted): [PS] C:\>Get-MailboxDatabase | Format-Table Name,Server,OfflineAddressBook -Auto Name Server OfflineAddressBook ---- ------ ------------------ exchange13database MAIL Mailbox Database 1765469630 EMS01 exchange16database EMS01 [PS] C:\>Get-ExchangeServer Name ServerRole Edition AdminDisplayVersion ---- ---------- ------- ------------------- MAIL Mailbox Enterprise Version 15.0 (Bu... EMS01 Mailbox Enterprise Version 15.2 (Bu... [PS] C:\>Get-Mailbox "Migration.8f3e7716-2011-43e4-96b1-aba62d229136" -Arbitration | Format-List Name,Database,ServerName,AdminDisplayVersion Name : Migration.8f3e7716-2011-43e4-96b1-aba62d229136 Database : exchange13database ServerName : mail AdminDisplayVersion : Version 15.0 (Build 1497.2) [PS] C:\>Get-Mailbox -Arbitration | Format-List Name,Database,ServerName,AdminDisplayVersion Name : SystemMailbox{1f05a927-876a-49e7-b208-e00c8b42248f} Database : exchange16database ServerName : ems01 AdminDisplayVersion : Version 15.2 (Build 221.12) Name : SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c} Database : exchange16database ServerName : ems01 AdminDisplayVersion : Version 15.2 (Build 221.12) Name : SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} Database : exchange16database ServerName : ems01 AdminDisplayVersion : Version 15.2 (Build 221.12) Name : Migration.8f3e7716-2011-43e4-96b1-aba62d229136 Database : exchange13database ServerName : mail AdminDisplayVersion : Version 15.0 (Build 1497.2) Name : FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 Database : exchange16database ServerName : ems01 AdminDisplayVersion : Version 15.2 (Build 221.12) Name : SystemMailbox{D0E409A0-AF9B-4720-92FE-AAC869B0D201} Database : Mailbox Database 1765469630 ServerName : ems01 AdminDisplayVersion : Version 15.2 (Build 221.12) Name : SystemMailbox{2CE34405-31BE-455D-89D7-A7C7DA7A0DAA} Database : Mailbox Database 1765469630 ServerName : ems01 AdminDisplayVersion : Version 15.2 (Build 221.12) [PS] C:\>Get-ExchangeServer | Where {($_.AdminDisplayVersion -Like "Version 15.0*") -And ($_.ServerRole -Like "*ClientAccess*")} | Get-ClientAccessServer | Format-Table Name,AutoDiscoverServiceInternalUri -Auto [PS] C:\>Get-ExchangeServer | Where {($_.AdminDisplayVersion -Like "Version 15.2*") -And ($_.ServerRole -Like "*Mailbox*")} | Get-ClientAccessService | Format-Table Name,AutoDiscoverServiceInternalUri -Auto Name AutoDiscoverServiceInternalUri ---- ------------------------------ EMS01 https://ems01.xxxxxx.local/Autodiscover/Autodiscover.xml [PS] C:\>Get-SendConnector | Format-Table Name, SourceTransportServers -AutoSize Name SourceTransportServers ---- ---------------------- xxxxxx.ru {EMS01, MAIL} Internet {} [PS] C:\>Get-ForeignConnector | Format-Table Name, SourceTransportServers -Autosize [PS] C:\>Get-ReceiveConnector -Server MAIL Identity Bindings Enabled -------- -------- ------- MAIL\Client Proxy MAIL {0.0.0.0:465} True MAIL\Default Frontend MAIL {0.0.0.0:25} True MAIL\Outbound Proxy Frontend MAIL {0.0.0.0:717} True MAIL\Client Frontend MAIL {0.0.0.0:587} True MAIL\Default MAIL {0.0.0.0:2525} True [PS] C:\>Set-ADServerSettings -ViewEntireForest $True [PS] C:\>Get-Mailbox -Server MAIL -ResultSize Unlimited [PS] C:\>Get-Mailbox -Server MAIL -Archive -ResultSize Unlimited [PS] C:\>Get-SiteMailbox [PS] C:\>Get-SiteMailbox -DeletedSiteMailbox [PS] C:\>Get-Mailbox -Server MAIL -PublicFolder -ResultSize unlimited [PS] C:\>Get-MoveRequest -ResultSize Unlimited | Remove-MoveRequest -Confirm:$false -WhatIf [PS] C:\>Get-MigrationBatch | Remove-MigrationBatch -Confirm:$false -WhatIf WhatIf: Удалить пакет миграции "1-13"? WhatIf: Удалить пакет миграции "14-28"? WhatIf: Удалить пакет миграции "3"? WhatIf: Удалить пакет миграции "123"? WhatIf: Удалить пакет миграции "4"? WhatIf: Удалить пакет миграции "5"? WhatIf: Удалить пакет миграции "6"? WhatIf: Удалить пакет миграции "7"? [PS] C:\>Get-Mailbox -ResultSize unlimited | Where-Object {$_.AdminDisplayVersion -like "Version 15.0*"} [PS] C:\>
Exchange 2013 Decommission
Hello, Current Environment : Exchange servers 2013 CU23 with latest update Edge servers also installed with E2K13, CU23 Hybrid Setup We are planning to decommission some exchange servers as consolidation plan. This decom is expected to be completed in a month Post decommission , is it recommended to resubscribe edge subscription. Please advise.