This is TERRIBLE! Besides being able to edit vector images like Will mentioned (which is important for those of us who don't have graphic artists available to create custom images or the budget or time to buy that service ad hoc), you could also search for style "families" (different graphics that were all in the same style). There was a huge range of files and styles in the collection and it was much faster to find what you need than to do a Bing search. Plus, you knew that everything there was free and free to use, without having to worry about CC license issues.
I use clipart often and transport it into other programs such as Print Master to make cards. It was easy to make a few small changes in it and use what you redesigned. I hope you'll reconsider it's removal and put it back. Personally, I don't care for Bing's images. And I don't want to go out on the net to find other clipart when I'm in the process of getting a manuscript together. It's a waste of time.
Which brings us to Creative Commons, the license Office’s new Bing-powered search filters for. My colleague Danny explained what Creative Commons is, and why you should use it What Is Creative Commons, And Should You Use It? What Is Creative Commons, And Should You Use It? Creative Commons is a set of licenses which automatically give you permission to do various things, such as reuse and distribute the content. Let's find out more about it and how to use it. Read More , but the quick version is that it’s a way for artists to tell the web their images are free to use.