i have no idea

On Server 2019 you should have the option to see the newly released updates, select which ones to install, and be able to manually install them when desired in all situations. Updates should not be automatically installed.

I have posted on Technet forums about this as well: Windows Malicious Software Removal Tool November 2019 reinstalling each time I run Windows Update on Windows Server 2019 (build 17763.864 ) . It ia not re-downloaded, just re-installed (re-ran) Is this a bug? I guess so, I hope the machine is not infected with some nasty thing.

the "Scheduled install day" and "scheduled install time" group policy settings under "computer/administrative templates/windows components/windows update/configure automatic updates" are being ignored by server 2016 in favor of "active hours." having active hours on servers is utterly ridiculous. I need certain servers to reboot in a certain order only on Saturday nights.

Please provide full information what is fixed in cumulative updates. What kind of information is this:

https://support.microsoft.com/en-us/help/4038782
Security updates to Microsoft Graphics Component, Windows kernel-mode drivers, Windows shell, Microsoft Uniscribe, Microsoft Edge, Windows scripting, Device Guard, Windows TPM, Internet Explorer, Microsoft Scripting Engine, Windows Hyper-V, Windows kernel, and the Windows DHCP Server.

We need proper description of fixes for an OS we pay licenses.

Windows update troubleshooter (fully patched server 2016) using the built-in tool always reports 0x80070057 "potential windows update database error detected" If you run the tool available here then no errors are reported. https://support.microsoft.com/en-us/help/4027322/windows-update-troubleshooter

I am missing to have more options than just a very common keyword search in Microsoft Update Catalog.

setting up filters like OS version, branch, x86 / x64 and update categories AND date equal / greater than would be amazingly helpful to find a specific group of updates.

Admit it, the current search is not very helpful if you are NOT searching for a specific KB but a set of updates.

E.g. try to enlist all Windows 2003 Server Updates released after January 2017. Good luck, trying.

When configuring the Windows Update Policy, you can only select the day and whole hours as scheduled install day. I would like to be able to configure hours and minutes (example 8 hrs and 15 minutes).

Also recurrencies like "every second tuesday of the month) would be beneficial.

we have designated maintenance windows for such things! It the OS decides i don't use the server at 09:00 and reboots for pending updates then there will be lots of upset people!
We generally install updates when we can then do the reboots in the maintenance window (as it's quite small on some servers)

An update, security patch or otherwise should only require a restart of a service where possible not require an entire system restart for every update.

Windows update only supports daily and weekly schedules. We need monthly, X th weekday of the month, and X th day of the month.

Daily and Weekly schedules do not offer enough flexibility to large organizations trying to update large numbers of systems. Please add support for monthly schedules.

Exchage within a Hyper-V VM with Windows Server 2012 r2: Update KB4057903 leads to an almost unresponsive server. I could reproduce the behaviour twice by deinstalling the update. Please, provide a new version of KB4057903 without the bug. Thanks.

See also the discussion in https://social.technet.microsoft.com/Forums/windowsserver/en-US/387da0db-6046-4838-9db7-c8ddcb6810da/update-kb4057903-fails-in-windows-server-2012-r2-hyperv?forum=winserverhyperv

The server works fine without the update. So why do we need it??

Considering the server availability, we administrators are not getting downtime as we desired. So, Microsoft should give the support for server OS to prevent the reboot the server in logged-off mode after windows update installation. I have a suggestion that I'm giving below. If it is possible, it is very helpful to the world of Windows administrators. Add the registry value in server at least in all available server operating systems

[HKEYLOCALMACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]

"NoAutoRebootWithLoggedOffUsers"=dword:00000001

https://social.technet.microsoft.com/Forums/windows/en-US/178c2075-98a3-4f9c-a121-b9b74522cad2/download-nonenglish-updates-from-windows-update-catalog?forum=w7itproinstall#1d010bae-c989-4615-9ce4-38c9f008935d

https://social.technet.microsoft.com/Forums/windows/en-US/178c2075-98a3-4f9c-a121-b9b74522cad2/download-nonenglish-updates-from-windows-update-catalog?forum=w7itproinstall#1d010bae-c989-4615-9ce4-38c9f008935d

https://social.technet.microsoft.com/Forums/windowsserver/en-US/5d7cd886-b8de-4f39-948f-f04991001927/windows-update-catalog?forum=winservergen#8266a0a6-abb8-43bd-a1df-4d5cdc78408c

https://social.technet.microsoft.com/Forums/en-US/w7itproinstall/thread/f9fafd3e-6d90-4699-bca1-0a7849fd6b77/#f9fafd3e-6d90-4699-bca1-0a7849fd6b77