EPACQ

The local copies of all your calendars, messages, events etc., is stored by the Personal Storage Folder within Microsoft Outlook. Your Outlook PST file usually becomes inaccessible as a result of a virus attack, due to the PST file exceeding the 2GB size limit or due to many other serious corruption issues which in the [...]

For one thing the mere act of compression of data into the PST file often results in lost emails. The PST file itself suffers from size limitations and will allow spillage of file when the inbox is over stuffed. Further, simple scanning of these messages when being downloaded by an antivirus program can result in [...]