We have been successful in the restoration of another mailbox database and we are currently restoring databases relating to the final email server out of the four that had been affected.
For those still unable to access their email, we estimate that this restoration process will be complete by later this afternoon/evening.
Some users will find that their access to email may return sooner then others which is simply due to the restore process.
You may also find that affected users won't be able use email via mobile devices during the restore process.
Currently 84% of all user mailboxes are accessible.