It was not originally written by MS, but comes courtecy of them having taken over a small software house. Although not as comprehensive as the commercial equivalents, this could be very handy if you wished you had Illustrator or Freehand, but can't afford them just like me.
What Microsoft wrote:Expression 3, the innovative vector-based stylish drawing and illustration software that continues to re-define vector graphics. Whether you are a veteran professional illustrator working on print-quality illustrations, a web designer building the most dazzling web site or a budding artist eagerly experimenting with various styles and techniques, you will find Expression 3 an indispensable tool for your creative tasks. It brings you the best of both worlds — the richness of pixel-based painting software and the convenience and editability of vector graphics.
Expression
freeware, about 55MB download. system requirement: Mac OS 9 and up, Mac OS X 10.1 and up.
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