When aproaching ORD from the east in a A320 yesterday, we suddenly begun climbing shortly after coming over land from the lake.

Later the annuncement was made, that because of windshear warning, they decided to land at a different runway. Can I trust that explanation?

Are all planes eqipped with Windshear warning system? If the answer is no, I would be kind of scared to fly any plane without the system.

I also wonder, if other planes behind us also were diverted to a different runway.