I'd like to download hundreds of mailboxes so I can delete them on Rackspace's Exchange 2013 server.
I've tried this tool and it's unreliable and unusable: https://www.recoverytools.com/backup/rackspace/#
I've tried Mailstore and it's reliable, but doesn't include calendar and contacts so therefore unusable.
Please note this Rackspace Exchange 2013 server isn't mine and I don't have command line or admin access. As far as I've seen, I can only get to the old mailboxes by having credentials to each. I'm contacting RS to confirm this.
Is there a tool you know of to download complete Exchange 2013 mailboxes and store them on on-prem storage for possible future use?