Review the following information before you restore individual mailboxes, mailbox folders, public folders, or messages:

• The destination mailbox must exist to successfully restore a mailbox.

• When you select individual items to restore from a backup that uses granular restore technology (GRT), select one or several objects. Do not select an entire mailbox for restore. Large restores from GRT may perform slowly. Cohesity does not recommend more than a certain number of items in a GRT restore (somewhere between 100 and 1000 items). For larger restores, restore to an Exchange Recovery Database (RDB) using Microsoft export and import tools.

• When you restore mailbox messages or public folder documents, the option Overwrite existing message(s) overwrites the contents and properties of the original objects. Messages are overwritten regardless of their location. (For example, if the messages were moved to the "Deleted Items" folder.)

  If the option Do not restore the message(s) is selected, NetBackup skips the restore of any message that still exists, regardless of the current location.

  If an original message no longer exists or if you select a different destination, a new copy of a message is created with the same contents and properties. A restored copy of the message does not count as the original message in the existence check.

• Restores that use Granular Recovery Technology (GRT) must be made from a disk storage unit. You cannot restore from the tape copy.

• NetBackup can back up the online archive mailbox for users. However, a restore from a backup using GRT by default restores the items to the user's mailbox and not the archive mailbox. Items are restored starting at the root of the mailbox hierarchy. Alternatively, you may want to redirect the restore to the path Top of Information Store\Inbox\Archives\.

• Exchange Server provides a feature to retain deleted items for a period of time after you "permanently" delete them. Because the deleted items still exist, NetBackup includes them in the backup image. NetBackup displays these items when you browse the granular backup image and you can restore these items.

• NetBackup does not support restoring mailbox items into tenant mailboxes in a multi-tenant Exchange environment. To recover items pertaining to a tenant mailbox, redirect the recovery to a non-tenant mailbox.