I have just learnt of a new tool – the Microsoft Outlook Inbox Repair Tool. The Outlook database is stored in a file, with the extension name pst. PST stands for Personal Storage Table. The Repair Tool optimises the data file by scanning it to see if it is intact, and resets & rebuilds if necessary. The tool is called scanpst.exe and you should only run it when Microsoft Outlook is closed.
You can typically find the scanpst.exe file here;
C drive:\Program Files\Microsoft Office\OFFICE12.
Read more about it here: –
http://office.microsoft.com/en-us/outlook/HA100758311033.aspx?pid=CH102499831033