Active Roles currently does not include the ability to create new remote mailboxes.
Active Roles 7.0.4 introduced new functionality for managing existing remote mailboxes. This functionality is also included in later versions and can be enabled by using the EnableRemoteMail registry key.
Enhancement ID 675080 includes the ability to manage existing remote mailboxes only. For more information on this configuration, please consult the release notes of the relevant Active Roles version for the above Enhancement ID.
Active Roles 7.4 includes functionality out-of-the-box to automatically create remote mailboxes when a user account is licensed for Exchange Online.
Active Roles is currently missing an on-demand trigger which will allow for the creation of a remote mailbox. This issue is being tracked as Defect ID 90780.
It is possible to create a custom script module which enables a remote mailbox using the Microsoft Exchange Enable-RemoteMailbox cmdlet.
For more information on this option, please contact One Identity Professional Services.