Office 365 has been steadily growing for many years to the point where it currently has over 200 million users. Many large and small organizations are increasingly taking advantage of cloud based services and infrastructure to reduce costs and increase availability to their users. So, when there is security issue with a major cloud based product it can have a massive impact on both users and organizations.
Source Incite recently provided a great writeup of how they discovered CV-2020-16875 to achieve Remote Code Execution and bypass TWO different patches for the vulnerability. This is a great example of how a vulnerability can still be relevant even if the product has been patched.
Great writeup here!