What you can do when Outlook begins to act up
If you’ve ever noticed that suddenly half of your Microsoft Outlook messages are not arriving there can be many reasons for this. All of these reasons will revolve around one area. That is your Microsoft Outlook PST file. The PST file is a kind of database that all of your messages and other Microsoft Outlook information are written to. The file has the ability to sort this information in the form of tables much in the same way a my SQL database works. Because as with all databases the PST file can be written to it is especially susceptible to a virus attack. For this reason it is recommended that one always use antivirus software to check over downloaded messages and files prior to their storage in Microsoft Outlook.
Oddly enough the very act of using anti virus software on Outlook messages sometimes results in the message itself being corrupted and that file damage being passed along to the Microsoft Outlook PST file. This results in a need for PST repair. Corrupted PST repair can be accomplished using an Outlook recovery tool.