When attempting to create a custom report based on the 'Inventory - Primary Mailboxes' datasource and selecting Account/Disabled Protocols fields and then attempting to filter by Disabled Protocols, 'Activesync' is not listed in the available choices. Why?
Please note that in Exchange Management Console the Exchange Active Sync is Enabled.
MessageStats gets the protocol values for a mailbox from attribute 'ProtocolSettings' of a user object by LDAP. This attribute just stores OWA / IMAP4 / POP3 / HTTP / MAPI protocols and does not store ActiveSync protocol. Hence the reason why MessageStats cannot retrieve ActiveSync protocol value from this attribute, and the dialog does not show the ActiveSync protocol.
Enhancement Request TF00228501 has been raised for this issue to be addressed in a future release of MessageStats