Due to Computer Reboot

Virus infection or application malfunctioning

Accessing PST file over network or through remote storage device

Migrating PST file between different versions of Outlook

Corruption due to PST files compacting

Amount of data stored in the PST file might have been exceeded the limited size of the file

www.pstemailrecovery.org/

Advanced Key Features of Enstella PST Recovery Tool

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http://www.enstella.com/dl/dlsoft.php?id=4

http://www.pstemailrecovery.org/