Creating a simple 3x3 table with one character in each cell, then exporting the note saves an RTF file which MS Word claims is invalid and will not open (tried with the 2000 and 2010 versions). Interestingly enough, WordPad opens the same RTF fine (tried with the XP Sp3 version).
As a sidenote, I understand that the table feature is still in beta. If it is premature to submit bug reports about it at this point, please say so.
Cheers,
Liviu