Years ago the complaint was levelled that Windows was not truly WYSIWYG for publishing - but that complaint really died with the introduction of TrueType Fonts.-Carol Haynes
That's not always true. There are some quirks in the Win way of rendering fonts between low & hi DPI devices (basically due to certain choices done regarding hinting).
Here's a simple test:
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Cut & paste the above in WordPad. Using Arial (Western) 10, the right margin will be just about "in line".
Do a preview and it still show up just right.
Now print it (even with a PDF virtual printer), and see the difference!
Clearly this represent an extremisation, but on a complex / real document, that may lead to some pretty interesting effects in some circumstances!

Bye!