Hey guys... K is an awesome software as far as scanning emails is concerned. It scan emails to tiniest part (using Parse Email Formats).
There is a problem, though with K and T'bird. As you might be aware that T'bird put mails in a single file. When you delete the mail from T'Mail, the mail is delted and the file is modifed in which all the mails are kept. (T'bird keps all mails in a folder in a single file)
Now when Kaspersky starts scanning with scan only new and changed files, it still scans the mails that are not modified,as the file under which all mails are kept (due T'bird structuring) has changed it scans all the emails. Thus slowing down the scan. There should be some solution for it, as T'bird is a major Email Client in the market. More popular then the Support K provide for BAT.