Did you ever wonder why Microsoft changed the line spacing in Word 2007? Well, here’s the answer:
Why did the line spacing change in Word?
And the “fix” is here:
Make my document look like a Word 2003 document
Some general information about how to adjust the line spacing and paragraph settings in Word 2007:
Adjust the spaces between lines or paragraphs
Personally, I like the new GUI approach in Office 2007 and its improved usability, but the new styles (with this very unusual line spacing) kind of overshoot the mark.