Windows Live Messenger contacts showing as online even though they are offline

[Pepijn Schmitz]

Since installing the new version of Pidgin (2.5.0) for Windows, Pidgin
keeps showing some of my Windows Live Messenger contacts as online, even
though they are actually offline. All of them have a mobile phone icon
next to their buddy icon, so that seems to have something to do with it.
However, I verified that Windows Live Messenger itself shows these
contacts as offline, so it seems to me that Pidgin should do too. It's
confusing that they are being shown as online and I can even send
messages to them, even though they apparently never get them.

Is there some way I can tell Pidgin not to show these contacts? Is it a bug?

And a related question: is there a description somewhere about the
different icons that can be shown and what they mean?

Kind regards,
Pepijn Schmitz