Microsoft patches three zero-days in May 2021 Patch Tuesday update Events About If you already have an account please use the link below to sign in. If you have any problems with your access or would like to request an individual access account please contact our customer service team. Microsoft patches three zero-days in May 2021 Patch Tuesday update Security update includes patches for Windows, Internet Explorer, Exchange Server, Office, .NET Core, Visual Studio, SharePoint Server, Hyper-V, Skype for Business and Lync Microsoft patches three zero-days in May 2021 Patch Tuesday update Microsoft has released its May 2021 Patch Tuesday update, addressing a total of 55 security vulnerabilities across various products and platforms.