In addition to Bob B's reply you might subtly hint to your boss that he
*not* drag 'n' drop or Paste images into his Mac docs... Nor should you do
so on the Win side
That's probably how the problem starts in most cases.
Have him use Insert> Picture> From File.
If he does it that way it really shouldn't matter whether the image is a
JPEG, PNG, GIF or TIFF ‹ although the TIFF format is extensible so it
depends on how the file was generated, but "usually" not a problem. The BMP
format (on either platform) & Mac PICT images should be avoided.
In Mac Word any images already in docs can be re-inserted by;
1- Control/Right-Click the image, select Save as Picture
2- Name the file & choose an appropriate image file format
3- Save
4- Delete the image from the doc, then use the Insert method mentioned above
to insert the image back in based on the new image file.
HTH |:>)
Bob Jones
[MVP] Office:Mac