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It’s not just the offline capability that is new, you were limited to 256 columns and 400,000 cells. Now you have unlimited cells and 2 million cells. So, yeah, I guess it is powerful enough. It might be like a Google Docs/Word comparison though - I can do everything I actually need to do with Google Docs, but Word is still a significantly better word processor, especially if you are doing mark-ups with other writers.