Word X is not completely Unicode capable. Therefore, the characters with macrons
that are available in the character palette cannot be copied correctly into a
Word document.
If you use TextEdit (comes with OS-X) you can copy and paste the macrons (and a
multitude of other special characters) in easily. They also print on standard
printers.
I have only tested this with Lucida Grande - which seems to have all the
necessary glyphs.
Otmar Foelsche