I use MS Outlook 2003 to read my company emails. Recently, it had started taking a long time in starting up. It also became sluggish and even opening an email would take a long time.
Some friends suggested that the my OST has grown too large. At 600MB, it certainly is big but isn't outlook supposed to handle upto 2 GB sizes easily.
Some googling got me to this post and introduced me to SCANPST, which is an Inbox repair tool installed by default with Microsoft Office but not available in any of its menus.
I just ran SCANPST from C:\Program Files\Common Files\System\MSMAPI\1033 ... It found and repaired some 1700 problems with the OST file!!!
Now my outlook is as snappy and responsive as before.