Oscar, first be advised: I don't know what I'm talking about. But...
MapInfo has a 'translator' module/program(?) that can create ESRI shapefiles. These files can then be configured into two .csv files using a bit of Richard Leeke's wizardry: the shapetotab utility. These can then be easily imported into Tableau.
Hope this works for you.
Edit: That makes a bit more sense.
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For mapinfo you have to select what you want and Export the Table to file which makes it a MIF file. You can then upload to excel and grab the Lat and Long to create Polygons.