This cumulative update includes some quality improvements.
Let's see what has improved according to the company:
We fixed a performance issue in Windows Mixed Reality (WMR) that allowed it to work properly for many users.
Fixed an issue that prevented some cleaning tools, such as Disk Cleanup, from deleting previously installed updates.
We have updated the start date of daylight saving time for 2020 for daylight saving time for the Kingdom of Morocco.
For more information, see KB4557900.
Security updates for:
Internet Explorer, Microsoft Scripting Engine, Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Input and Composition, Windows Media, Windows Shell, Microsoft Xbox, Microsoft Edge, Windows Fundamentals, Windows Cryptography, Windows Authentication, Windows Kernel, Windows Virtualization , Windows Update Stack, Windows Core Networking, Internet Information Services, Windows Network Security and Containers, Windows Active Directory, Windows Server and Microsoft JET Database Engine.
If you are already using a version of Windows 10 of these rings and you have installed older updates, only new ones contained in this package will be installed.
If you are an Insider you can update from Settings - Update and Security - Windows Update. Check manually for updates and choose to install the May 2020 update.
Microsoft has already completed the development of 20H1, so the latest versions do not have the watermark on the desktop. It is expected to be released for all in May 2020.