More detail, as lots of people reported at https://www.isitdownrightnow.com/microsoftonline.com.html https://www.isitdownrightnow.com/microsoftonline.com.html,

More detail, as lots of people reported at https://www.isitdownrightnow.com/microsoftonline.com.html https://www.isitdownrightnow.com/microsoftonline.com.html, the problem is that the login URL is giving a 503, Service Unavailable result.