Let's say you have a user who has accidentally deleted all her emails and you have no other way (but you should!) to restore them. Luckily enough, you have a full Exchange backup made by Windows Server Backup. Here is the fastest way:
1. Create C:\MyRec
2. Start WSB Recovery Wizard, select "Applications", "Exchange", select your relevant Exch backup and "Restore to other location" -> C:\MyRec
3. Navigate to your C:\MyRec\[..recovered folder..]\ mailbox folder, start an elevated command prompt and type eseutil /MH "Mailbox Database [numbers].edb"
3.a: If you see a line "State: Dirty Shutdown" you have to do a eseutil /R E00 /i /d being in the mailbox directory above.
3.b: Do a eseutil /MH ... again and if you get a "State: Clean Shutdown" you are out of the water.
4. Unfortunately, you have to create a dedicated Recovery Database: Start an Exchange Management Shell and run: New-MailboxDatabase –Recovery –Name MyRecDB –Server MyTestServer
–EDBFilePath C:\MyRec\[..recovered folder...]\"Mailbox Database [numbers].edb" –LogFolderPath C:\MyRec\[...recovered folder..]\
5: Bring online the new database with the GUI (Exchange Management Console): In the tree open Organization Configuration/Mailbox. You should see MyRecDB here with dismounted status. Mount it.
6. In the Exchange Shell, type: GetMailboxStatistics -Database -MyRecDB
7: Check if your username apears
8. Type: RestoreMailbox -Identity "Your username here from the list" -RecoveryDatabase MyRecDB and type Yes
9. Mailbox content of your user has been recovered into the root of her original mailbox. Problem solved.
PS: I noticed that someone already made a more decent blog about this issue. I find it ubercool so you definitely want to check it out.
PS2: Get email level recovery (PST) advice here.