http://www.businessinsider.com/ex-yahoos-confess-marissa-may...
"'For what it's worth, I support the no working form home rule. There's a ton of abuse of that at Yahoo. Something specific to the company.' This source said Yahoo's large remote workforce led to 'people slacking off like crazy, not being available, spending a lot of time on non-Yahoo! projects.'"
"Mayer saw another side-benefit to making this move. She knows that some remote workers won't want to start coming into the office and so they will quit. That helps Yahoo, which needs to cut costs. It's a layoff that's not a layoff."