In relation to Avaya Aura® Messaging, note the following points. These points apply to Avaya Aura® Messaging only. Avaya IX™ Messaging, also known as Officelinx, is not impacted.
Starting with 10.2.x, if AAM is managed by System Manager then before upgrading System Manager, clean the AAM data from System Manager.
You must administer mailboxes natively in the AAM Management interface.