Shoutbox

Note that the Mac version numbering is quite different than what is used on Windows. So that on its own is no indication at all as how far behind or upfront they are compared to the Windows version. You simply can't compared them by using version numbers.

Moreover, the Mac version is made completely independant from the Windows version. They use the same protocol (and roughly the same layout and error messages for consistancy) and it both comes from MS, but that's it.

But yeah, in general, the Mac version is a few steps behind the Windows version. But that does not automatically mean they wont implement MPOP in the next version (version 8 or something, dunno), nor does it mean they will though...

MPOP (Multiple Points Of Presence) is the feature which allows you to sign in on different computers (aka locations) with the same account, at the same time.

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Anyways, as long as you do not have a toast saying "You have signed in to Messenger on another computer. Click here to sign in again." like andrey said, nobody is signing in on a different computer into your account. Notice how the message is very different from a simple "You have signed out" message! So unless you have a toast popping up with that message ("you have signed in on another computer"), you don't have anything to worry about (security wise).