Silverlight, Flash, and Shockwave are all getting the chop. Silverlight and Flash will no longer be available to standalone versions of Office 365. Microsoft will add more protection for people not using the specified version. Microsoft has you covered even if youre not a monthly subscriber of the Office 365 service. Youll have to do a spot of registry editing yourself to shore up your defences. If you used to run a malware campaign based around use of these controls, that wont be the case for much longer.”]
Source: https://blog.malwarebytes.com/cybercrime/2018/06/blocks-flash-others-coming-office-365/