Considering only such life as might be considered intelligent: very high for this galaxy by itself. For other galaxies, it doesn't matter since there won't be contact any time soon, sub-space FTL tunneling notwithstanding.
That will always be a fair question to ponder but let me suggest asking that question from an assumptive position.
What are the odds of other life in the universe ever crossing paths in time and location with life on earth?
Consider that all locations in space are virtually empty and distance is measured in time at the rate of six trillion miles per earth year. The odds that different lives in the universe would cross paths and be within 10-100 million years of each other in time approaches infinity.