Kish, probably because MS Word fakes it.

You can fake it in the Xara Desktop application too.

For Print documents, just add a Line width of 0.5px or as effective for your font size.
This will not show in Web documents though.

It is a bit more messy for Web documents.

Create a Character Style and name it 'bold'.
As a Character Style will not hold a Line width, give the 'bold' style an underline and a strikethrough for good measure.
Create a CSS block of
Code:
<style>
.bold {
  font-weight: bolder;
  text-decoration: none;
}
</style>
and add to Website Body (code).

To handle both Web and Print at the same time could probably be handled with an @media CSS statement but I have not gone that far yet.

Acorn