Emails are removed from the Deleted Items folder after a certain period set by the account administrator, when you empty the Deleted Items folder, or if you permanently delete a message in the Deleted Items folder. For most Exchange accounts, messages that are purged from the Deleted Items folder may be recovered for a period of time. This time period depends on how the Exchange administrator set up your account. This also applies to emails that were permanently deleted.
To restore messages that have been removed from the Deleted Items folder in Outlook for Windows:
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