запустите на старых серверах:
Start-Transcript EnvironmentBackup.txt
Get-OutlookProvider | Format-List
Get-OutlookAnywhere | Format-List
Get-ClientAccessServer | Format-List
Get-ActiveSyncVirtualDirectory | Format-List
Get-AutodiscoverVirtualDirectory | Format-List
Get-EcpVirtualDirectory | Format-List
Get-OabVirtualDirectory | Format-List
Get-OwaVirtualDirectory | Format-List
Get-MapiVirtualDirectory | Format-List
Get-PowerShellVirtualDirectory | Format-List
Get-WebServicesVirtualDirectory | Format-List
Get-SendConnector | Where-Object {$_.Enabled -eq $true} | Format-List
Get-SendConnector | Where-Object {$_.Enabled -eq $true} | Get-ADPermission | Where-Object {$_.extendedrights -like "*routing*"} | fl identity, user, *rights
Stop-Transcript
Дополнительно для проверки:
Resolve-DnsName -Type A -Name mail.domain.com
Resolve-DnsName -Type A -Name autodiscover.domain.com
Resolve-DnsName -Type A -Name mail.domain.com -Server 8.8.8.8
Resolve-DnsName -Type A -Name autodiscover.domain.com -Server 8.8.8.8
Resolve-DnsName -Type MX -Name domain.com -Server 8.8.8.8
Resolve-DnsName -Type TXT -Name domain.com -Server 8.8.8.8
Resolve-DnsName -Type A -Name i-should-not-exist.domain.com -Server 8.8.8.8