And you won't be able to buy such a license because Segoe UI is not available for this. However, embedding the font (such as by including it on a website with would require an additional license because it would involve making and distributing a copy of the font (and providing the font file to other people's computers) which most certainly is restricted and subject to the license of the font. (Fonts are licensed like software, so a font license does not specify what you can do with artwork produced using the font, just as Photoshop's license doesn't specify what you can do with artwork produced using Photoshop as long as you legally are entitled to have the font installed on your computer, you can produce any artwork you like with it). Once you have a legitimate copy of the font in your possession, feel free to use it to create whatever graphics or designs you like, including your logo. Therefore, if you don't have it already, buying a copy of Windows 7 would be a legitimate way of obtaining Segoe UI for use on the computer you install it on. Segoe UI is not for sale, and only available pre-packaged with certain Microsoft products.
