For reasons I do not know - could be just the way MS does it, could be some
typographical tradition - the row height (i.e. distance from the gridline at
the top of one row to the gridline at the top of the next is
the row hieght you specify in Table|Table Properties|Rows
plus
the maximum of the bottom cell mergin you specify in Table|Table
properties|Table|Options and the individual cbottom cell margins you have
specified in each cell in the row, if you have specified any.
In other words, changing the top cell margin merely causes the top of the
text to move downwards in the cell. Changing the bottom cell margin moves
the cell boundary downwards.
And that is probably one of the biggest oversimplifications I've ever
written
I really don't know how all these variables are used in Word.
The above was researched using the values you specified (so you could have
done it yourself, really!), i.e. with a fixed row height. So if you happen
to have cells of different heights, cells split into two rows, non-fixed row
height, I don't know what the impact is. Perhaps one of the folks in the
microsoft.public.word.tables group has a complete algorithm.
So in other words, what you probably need to do is decrease the value in
your Row Height box by 0.12".