I'd be surprised if there isn't other microbe-like life in our own solar system. And the path from microbial to "complex" life is just a matter of whether the e

I'd be surprised if there isn't other microbe-like life in our own solar system. And the path from microbial to "complex" life is just a matter of whether the environment provides enough energy to support it (nearby sun + photosynthesis in our case). This is because cellular communities will always have certain niche advantages (homeostatis etc). Complex life developed on Earth because it is advantageous in a physics/evolutionary sense, not because the universe accidentally slipped on a banana. Complex life is only an "accident" in that the search algorithm took a while to find the maxima. Otherwise it's just a matter of running the search long enough, and for that all you need is a star.