Microsoft Forced to Suspend Email as a Notification System for Security Alerts | Security content from Windows IT Pro
Not yet confirmed, but it's assumed this is because Canada's Anti-Spam Law Comes into Force on July 1, 2014. It's also important to recognize the word-smithing of the email and realize that Microsoft uses the word "suspending," seemingly to suggest that it may resume in the future. Many companies are now trying to figure out how the Canadian law will affect email communications. As soon as Microsoft is able to figure it out, it's possible that email will flow again for security information.