Bing Delivers 5 Times as Many Malicious Websites as Google
To be fair Bing is nowhere near as dangerous as Yandex. Not even in the same league.
Doesn't surprise me. Hotmail also isn't particularly secure, so myself and everyone I know switched to Gmail. I'd rather have targeted ads then have my Hotmail account hacked and spam all my contacts (has happened to me, my wife, and many other people I know - interestingly I've never had issues with viruses or any other accounts being compromised, ever - just Hotmail).
Microsoft in general is just terrible. Bad OS, bad services, bad software, and too expensive. Best computing-related decision I ever made was purging all my PCs of Windows and installing Linux OSes...