When you click (once) on a picture in Word, it displays a Picture toolbox.
One of the buttons (second left on mine) you can click and select grayscale or black and white.
You could also do this with a macro.
If the reason you want to convert pictures to B/W is the size, you have another possibility:
In the Save as dialog, on the upper right, there is the tools menu. One of the options in this menu is 'Compress Pictures'.
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