Nowt wrong with OE
Why is everyone bashing Outlook Express? I've used it for the past seven years, is perfect for my needs - a simple and sturdy email client - and I've never had a problem with it. Never had a email virus either, but the email server is mostly to thank for that as it uses blacklists, whitelists, and greylisting, as well as virus scanning all emails before they are released for download to OE. I presently have just under 1Gb of emails stored in my OE .dbx folders (which are backed up daily), and OE shows no sign of slowing down.
It's not what you use that's important, it's how you use it and the security measures you take to safeguard your data.
As others have said, If the Indian PMO has lost emails, then they need to find out why, and not just blame OE. I very much doubt that the problem lies with OE.