If you are pretty sure that your Microsoft outlook is not running slowly owing to a partitioned hard drive or an excessively used CPU, in addition to various mal wares, then get your MO checked for its slow functioning. There is a great chance that a professional will suggest to you of certain PST file damage.
Large organizations use a separate personal e-mail system of theirs. They do not want to align to Yahoo or MSN and thus they attach to Microsoft Outlook. However getting the PST loaded beyond the allocated size leads to data erosion. Generally, the size allocation is in the realms of 2 GB.
Once this happens, the PST files are left unusable and the data can hardly be synchronized. Slow functioning of PST files can also be the direct result of removal or corruption of Control data extension add-ins.
Sometimes as an operator, you would see that the outlook freezes decisively. In such an event you must keep shy from closing the system. This only makes the corruption more difficult. PST repair is possible and there are various means to recover data. Disk Doctor’s e-mail recovery (.pst) is a nice tool for applying such emergency measures.
This way you can repair your pst file. But if your file is badly damaged you may not able to repair it. At that time you can use some software. You can try a tool called Advanced Outlook Repair to repair your PST file. It is a powerful tool to recover messages, folders and other objects from corrupt or damaged Microsoft Outlook PST files.