Ah okay, your post got caught in the spam queue ?? And it’s not browser persecution, let’s not be silly ?? It IS a bit of a nanny-call, but … well I can see why.
IE 7 and IE 8 in compat mode get the big red insecure warning (which is correct).
IE 8 in NON compat mode gets the ‘outdated’ message, which when you get down to it… IE 9 is out, so yes, you ARE using an outdated browser. (FWIW, I realize I’ve never looked at the backend of my site in IE.)
As for Firefox, while V3 is still supported, v4 is not supported by Mozilla (3 only is b/c of XP I suppose).
But basically you’re going to see that alert (red if you’re WAY out of date, yellow if not) as long as you’re not using the latest and greatest browser. So … yes. Yes you are using an out of date browser, and yes, yes you should upgrade if possible.