I wouldn&#x27;t say that they are &quot;the best in class&quot;. I have recently (~3 months ago) reported a pretty important security flaw in outlook.com (including its Office 365 version). They have only found the issue a week ago or so (and it isn&#x27;t fixed yet!). I like Microsoft, but their awful responsiveness doesn&#x27;t make me want to use their products, or to work again for them.