Is it possible to activate a retail copy of ARMA2 over steam?

[alleycat]

Is it possible to activate a retail copy of ARMA2 over steam?

[BoneBoys]

I don't believe so but I think its possible to add a non Steam game to my games list.

This should allow you to use the Steam overlay in-game, chat/talk & friends...
My son uses this method for some of his games. I am not sure about ArmAII.

Might help might not.

[Maruk]

Exactly. You can not activate the game via Steam or make it part of your Steam games library but you can add it as non-Steam game to the list which should resolve most of problems.

[alleycat]

Will a retail box arma2 install work with a steam install of OA with the Combined operations thingy?

[Dwarden]

Will a retail box arma2 install work with a steam install of OA with the Combined operations thingy?

yes, combining distributions works fine ...