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Can it run Microsoft Office?
There's a difference between being Office-compatible and running Microsoft Office. Almost everything has an Office-compatible solution these days. But because I'm transferring complex files to clients who use real Office, I'm looking for a real office solution.
64-bit iPad 5: Yes, for most people (but probably not me) Microsoft, notoriously, has not released a version of Office for the iPad. But the iPad has many Office-compatible apps that are quite good.
For most people, this would be fine. For me, though, since my PowerPoints are huge, and have to be injested by a third-party webcast broadcasting system, there might be some incompatibility problems. Because I do so much with pure PowerPoint, it's probably not a fit with me, but otherwise the iPad is pretty good (although see my notes on Outlook below)
Surface 2 RT: Pretty much. This is the one place where the Surface RT shines. I honestly think Microsoft should have called it the Office Machine. Surface RT has a complete implementation of Microsoft's Office and it's a good one. Not sure there's enough RAM to handle my multi-thousand slide PowerPoint files, so it might not make it for me, but it would work for most people.
Surface 2 Pro: Yes. Quite well. Again, the good amount of max RAM available combined with fast processors and full Windows makes this a win.