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Assuming they accidently deleted them and they're using Outlook 2007, click Tools/Recover Deleted Items. 
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Assuming they accidently deleted them and they're using Outlook 2007, click Tools/Recover Deleted Items.

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I'll try this. What if there is nothing to recover. could I find them in the exchange server
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I'll try this. What if there is nothing to recover. could I find them in the exchange server

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That depends on if you cache off of the server, or download and clear messages. Do you know if Outlook connects via Exchange Mailboxes, or if it uses POP or IMAP?
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That depends on if you cache off of the server, or download and clear messages. Do you know if Outlook connects via Exchange Mailboxes, or if it uses POP or IMAP?

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user lost yesterday mail in inbox how do I recover
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user lost yesterday mail in inbox how do I recover

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.