Since my application integrates with Outlook and the users should sign up via the Microsoft (office365 or Live) sign up page is there any special design guidelines I should follow for the signup button like the ones required by Google. If not, can I use the Microsoft logo (in terms of legal issues) on my sign-up button like this: https://www.screencast.com/t/dUjsjZiIB
P.S. Sorry for this question not being particularly technical, but the matter is important for a live com application and I struggled to find anything specific on this around the web.