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Everyone emails Excel spreadsheets around. The only problem is getting into email jail.

I think your problem is Sharepoint solves this problem (emailing spreadsheets) and is pretty standard these days.

Sometimes spreadsheets are too big to email, then people split them up manually, or try to get some one else to transfer it for them.

Sharepoint can solve this problem but setting up and using it is non-trivial if your not a techie (and maybe even if you are).