Lost Mail Item / Mailbox
This scenario is not a service failure but more of a userrequest (e.g. user requires recovering a mail item which he deleted and is nolonger in the mail deleted item retention period; or a previously deletedmailbox needs to be restored for audit purposes). In both cases, a mailboxneeds to be recovered from backup from a certain point of time. Once thatmailbox is recovered, then any data in that mailbox can then be extracted andprovided to the user (e.g. as a PST file).
To recover a single mailbox, a Recovery Database mustbe created on the server that mailbox is to be recovered to.
A recovery database (RDB) is a special kind of mailboxdatabase that allows you to mount a restored mailbox database and extract datafrom the restored database as part of a recovery operation. After you'vecreated an RDB, you can restore a mailbox database into the RDB by using yourbackup application (or if you have the database and its log files in the filesystem, by copying those to the RDB file structure). Then you can use theRestore-Mailbox cmdlet to extract data from the recovered database. After beingextracted, the data can then be exported to a folder or merged into an existingmailbox. RDBs allow you to recover data from a backup or copy of a databasewithout disrupting user access to current data.
The Exchange mailbox servers have been provisionedwith a Recovery LUN to be used in such situations. The database in questionneeds to be restored to this free disk. There is no impact to live users duringthis operation.
The procedure for recovering a mailbox is as follows:
New-MailboxDatabase -Recovery-Name DB01 -Server MBX SERVER NAME 1
-EdbFilePath "R:\Recovery\<DB_Name>.edb"-LogFolderPath "R:\Recovery"
ESEUTIL /R E00 /l “F:\Recovery”/d “R:\Recovery”
Once data has been restored, you can dismount theRDB and delete it and its files.