thx!
Edit: I got "assessment failed: Unable to connect to the server", for pop3.live.com , same result for pop-mail.outlook.com.
(no surprise there, since pop3.live.com is an alias)
I believe there's nothing the users can do to fix this, except wait, right?
BTW, If I uninstall avast, then I can access the server normally, no errors and mails go in and out as usual.
Finally, If I click on the "view" button on the window that pops up when I try to access my hotmail account using Thunderbird, I can see the certificate, is -in fact- issued by Globalsign.
Edit: Clearing the certificate cache doesn't fix it.