From what I've done, yes. But it feels different and may not fetch all accounts in one pass, but it does work.
Free AVG did flag an unsolitec virus, so that seems to work with that. I can't answer for other antivirus. But I use MailWasher to prescreen email. As to outgoing email, I'm not sure and haven't tested. I'll write doubtful on this area.
...multiple ISPs- like it is possile with MS Outlook Express ? Does Thunderbird support HTML and does it come with a HTML editor like OE ? Is it supported by the major anti-virus programs for scanning incoming and outgoing e-mails ? Thanks.