Technical Overview: Microsoft Exchange Server 2019 CU12 (KB5011156)
: Added a mechanism to remove the final on-premises Exchange server when all mailboxes have been migrated to the cloud. exchange 2019 cu12
CU12 was notable for introducing the following: exchange 2019 cu12
: Added support for Multi-Factor Authentication (MFA) enabled admin credentials in Hybrid Management PowerShell cmdlets. exchange 2019 cu12