Sorry if this has been posted before, but I've tried searching for the answer and found nothing.

If I buy entrenchment, will I be able to play multiplayer games with friends of mine that don't buy entrenchment? I've got a solid group of people that I play with, but most of them don't want to shell out the $10 bucks for entrechment just yet because they haven't been playing the game long enough.

I've only been playing Sins for about a week and I really want to pick up the expansion , I just wanna make sure I'll still be able to play with the old crew (of cheapskates )

Thanks.