If the backup is invalid, or if there is no backup for the time period in question, then the deleted data is unrecoverable. This of course assumes that there is a policy that allows for single item restoration and that this process isn’t a really low priority for the Exchange administrator.
The Exchange Administrator extracts the deleted item and provides it back to the user. The Exchange administrator successfully restores the database to a recovery storage group. The Exchange administrator locates a backup that contains the item in question. The user knowing when he deleted the item. Instead, the user must call the help desk and request recovery of the item. If the item’s deletion timestamp is beyond the deleted item retention period, then the item is not available for end user recovery. 
This results in the deletion of the message permanently from the user’s mailbox. The user can purge the item from recover deleted items. The recovered item is placed back in the Deleted Items folder. Assuming the deletion timestamp of the deleted item is still within the deleted item retention period, the user has two choices: The user can recover the item.Using Outlook the user accesses Recover Deleted Items.
The user then realizes he requires the previously deleted item. The user empties the deleted items folder (or an automated process like Managed Folders or Records Management deletes items out of the deleted items folder on a scheduled basis). The message is moved to the Deleted Items folder. The end user recovery process worked typically as follows: The default deleted item retention window in Exchange 2003 is 7 days, while with Exchange 2007 the default is 14 days. Administrators configured the dumpster setting on a per database or per mailbox basis. The end user single item recovery functionality was enabled through the store via the store dumpster. Single Item Recovery in Previous Versions of Exchange This results in the item bypassing the deleted items folder and being directly placed in dumpster. Hard Delete via Outlook (Shift-Delete) – This is when the end user performs a shift-delete on an item. Store Hard Delete – This is when an item has been marked for purging out of the store. Store Soft Delete – this is when an item has been deleted from the Deleted Items folder and placed within dumpster. The following definitions may be useful for understanding the content within this article: Storage Performance and Utilization Management. 
Information Archiving & Storage Management.Hybrid Active Directory Security and Governance.Starling Identity Analytics & Risk Intelligence.One Identity Safeguard for Privileged Passwords.
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