Can I scan old emails for viruses?

I use McAfee and Outlook 2000, Win ME.

In McAfee/Properties/Email Scan, for Internet mail (I am not using Exchange) only, you are not given the option to scan anything other than incoming mails.

The ‘Select Folder’ option becomes available if I select ‘Microsoft Exchange MAPI’ but when I hit ‘Browse’ to choose a folder I get an ‘Incorrect MAPI version’ error.

I suspect I have some old mails with the Kak virus.

Regards