Youtube not working on WinServer2008R2, okay on Win7

[pcmaster]

Operating system: Windows Server 2008 R2 x64 Standard, Service Pack 1, Windows_NT 6.1
Browser version: 27.4.2, 20170821181241, 64-bit
Problem URL: youtube.com
Theme: Default
Installed extensions: NoScript 5.0.10
Installed plugins: Adobe Flash 27.0.0.130

Hello, a few months ago, I have no idea with which version exactly, Palemoon stopped playing Youtube videos. I always get the error "An error occured. Please try again later". I searched this forum, Mozilla forums... I didn't find anything recent.

The problem is that on my machine at work, which is exactly the same except the OS is Windows 7 x64 Professional, Service Pack 1, Palemoon works with Youtube just fine.

I tried totally uninstalling Palemoon (I haven't tried nuking Windows Registry, yet, nor deleting prefs.js by hand, though), before that I tried reverting all settings in about:config, I tired uninstalling Flash, I tried unistalling NoScript, I tried running with all extensions disabled, I tried logged in with Google, logged out, Private browsing, normal browsing... Nothing helps. On my 2008R2 machine it doesn't play Youtube, on the 7 machine it does.

I love Palemoon, I've been on it for at least 6 years, I think. Please, help. Thanks for anything!
.P

[JustOff]

Do you have Desktop Experience feature installed?

[pcmaster]

I do have Desktop Experience installed. I've always had it, already when Palemoon used to render Youtube right.
I also installed Windows Media Services. Didn't help.

[JustOff]

See also Update for Desktop Experience Decoder for Windows Server 2008 R2.

[pcmaster]

Nooo way! It works now, epic, big thanks Resolved!
I'm normally reading release notes but I could have missed this. I guess it starting using this feature which is automatically installed on Windows 7, right?

[JustOff]

Yes, and moreover, for unexplained reasons Microsoft did not include this update in Windows Update for 2008R2

[Moonchild]

for unexplained reasons Microsoft did not include this update in Windows Update for 2008R2

One simple reason: it a frikkin SERVER O.S. -- those don't need this kind of thing; in fact you usually want to keep it as low on media libs as possible.