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What happened to the Cybermen in our universe?

Like many people, I never had a chance to watch the original Doctor Who and got started with the new series and I've been catching up along the way. I always knew a little about the series, but just never had a chance to watch it. So I had heard of Daleks and Cybermen, and knew that the Cybermen that Lumic created were not the original Cybermen. I remember the Doctor saying, "It's happening again," when he sees Lumic's Cybermen.

What happened to the original Cybermen from the original series? Were they finally destroyed?