The latest moronic obvious bug that Microsoft have introduced is to break the "a newer response to this email is available" type functionality.
How? When composing an email, for example a reply, the email is saved to drafts periodically. This is good and very helpful for when Outlook crashes and burns, such as it does more and more now. What is not good is that when composing the email and then coming back to it a little later, a banner is now shown stating that there is a newer response in the email thread. What is this newer response? The fucking saved copy in your own draft folder of course.
Incompetence knows no bounds in Microsoft, but it's there as Microsoft deliberately introduce such moronic new bugs just to push people to use something new and "modern" (the new catch-all for "shit").