Very often a virus will enter your PC and the result of this is that your emails start arriving into your Microsoft Outlook inbox in somewhat of a hit or miss fashion. Usually you can restore your mailbox to full operating status by simply removing the virus. But sometimes the virus will manage to write itself directly onto your Microsoft email application. It does this by scripting a line or two of code into the Outlook PST file. When this occurs you have several options. One is to migrate your archived Outlook messages and customization settings to a safe location. After this is done you can reload Microsoft Outlook.
Another option is to use an Outlook recovery program to repair the Outlook PST file itself. Usually the process of putting a corrupted Microsoft Outlook program back into operation requires a little bit of both and for that you will need a quality PST repair program. This will allow you to repair Outlook inbox functions as well as locate deleted Outlook messages and import and export all Outlook files.