In an Avaya Messaging High Availability installation, which requirement must be met?

For an Avaya Messaging High Availability (HA) installation, it is essential that all servers are members of the same Windows Domain. This requirement is crucial for ensuring proper communication and synchronization between the servers involved in the HA setup. Being part of the same domain allows for integrated security, centralized management, and easier resource sharing, which are all vital for maintaining the high availability of the messaging system.

References: The requirement for servers to be members of the same Windows Domain in an Avaya Messaging HA installation is based on Avaya’s standard guidelines for network and system configuration to achieve high availability12.