Which three Operating Systems are Messaging 10.

Avaya Messaging 10.8 SP1 supports installation on several Windows Server operating systems. The supported versions are Windows Server 2012R2, Windows Server 2016, and Windows Server 2019. These operating systems provide the necessary environment for Avaya Messaging to function correctly, offering stability and support for the features required by the messaging system.

References: The supported operating systems for Avaya Messaging 10.8 SP1 installation are listed in the Avaya support documentation and related resources12.