how can we help all the messenger plus users from Syria who lost internet connection ?

Nothing we can do about it... Messenger Plus! is just an addon for Windows Live Messenger. If they country lost internet connectivity and cannot connect to the Windows Live services how can Messenger Plus! do anything?!?

we need to send our support to all the Syrians who lost access to the free world and getting killed for freedom

And what exactly do you expect the community and Yuna Software to do? There isn't anything anyone can do.

The community, Kimahri Software and Yuna Software do not, in any way, influence the government.

There are efforts like Telecomix to try and provide internet access where it is blocked and set up communications. Their Syria page looks very empty though. But if you are interested in helping out their chat is probably a good place to meet like-minded people and start organizing something.

There is always something people can do. But this place is probably not the best place to mobilize masses these days.