Why is this update (KB5041169) for .NET Framework called an Update Preview?

Microsoft recommends that we apply this update (KB5041169) for .NET for Windows 11 (also described here):

July 25, 2024 - KB5041169 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 22H2 and Windows 11, version 23H2

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Why is this called an Update Preview? In other words, I'm asking about nomenclature -- specifically, what does the term preview mean?

Does preview mean it's not a full/general release? If it's not a full/general release, then why is it listed in Windows Update (albeit under Optional updates: Windows Update > Advanced options > Optional updates)?

classic35mm said:

Why is this called an Update Preview? In other words, I'm asking about nomenclature -- specifically, what does the term preview mean?

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It's what others devs call "Beta" release - while Microsoft devs call it Preview (even tho - they use Beta terminology too for New Windows Builds part of the Insider Program). It's a full release (sort of - or at least at the time of release - it's what they managed to put together in terms of fixes or extra features), but the final release might include more stuff or gets polished better - in case there's bug/issues reports from those who decide to try/install this releases. Still, the Previews - released on this public channels are usually better polished than Insider releases (some more fitting to be called "Alpha" release - with partially functional new features).

neves said:

It's what others devs call "Beta" release

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Thanks for the insight. It seems somewhat strange to me that Microsoft is recommending that end users install "Beta" releases.

Preview Updates are early releases of nearly complete, upcoming Updates. They're provided to outsiders for testing future changes before the official Update is released. Some organizations have strict policies that demand they install every MS Update within a certain number of days. Having the Preview version allows them to perform compatibility testing, and provide feedback to MS in case something is terribly wrong.

Every Preview Update is matched to a production release of the same Update, usually a few weeks or a month afterwards.

Unless you're waiting for a specific bug fix or new feature, it's normal to just wait until the normal Update is released. Unless you want to be a beta tester for MS.

Windows Update will show you Preview Updates, if you have the "Get the latest updates as soon as they are available" setting enabled.

classic35mm said:

Thanks for the insight. It seems somewhat strange to me that Microsoft is recommending that end users install "Beta" releases.

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Not really, since they do "fix" some issues. So basically, you get a fix for some issue you might be facing - sooner (that's the Win part). Tho, there is a small risk for something going wrong "on a specific Windows configuration (something they missed)" - which makes it more of a "help me, help you" scenario. But in theory - even preview releases should work on most machines. Another way to put it - you could also look at "Preview" releases as a "Hotfix" release. Some people really need them - to deal with a specific issues solved in this update, instead of just putting up with a given bug and just wait for the official release.

For .NET updates released on the 4th Thursday of the month, this is essentially the same as the update that will appear on the 2nd Tuesday of the following month, unless any issues are discovered between the release of the preview and the final version. The same holds true for the OS Cumulative update released on the same date except that the preview update does NOT include the security updates.