Microsoft releases some ‘optional, non-security, C/D Week’ Win10 patches. Avoid them.

I’ve always detested Microsoft’s “optional, non-security, C/D Week” patches because they’re confusing, easy to install accidentally, rarely solve any pressing problems, and potentially introduce yet more bugs. 

Guess what? They’re back. 

As promised last month, Microsoft has started pushing them out again.

In a twist, they’re only being offered via Windows Update (or for manual download). That means organizations using update servers need to jump through several hoops to get them distributed. Few will bother. That’s OK. These C/D Week patches aren’t meant for stable corporate machines. They’re for enthusiasts and seekers, as well as unsuspecting normal users who get sucked in as beta testers.

Perhaps the cruelest irony: Microsoft stopped releasing these patches back in March for a good cause, saying at the time:

We have been evaluating the public health situation, and we understand this is impacting our customers. In response to these challenges we are prioritizing our focus on security updates. Starting in May 2020, we are pausing all optional non-security releases (C and D updates) for all supported versions of Windows client and server products (Windows 10, version 1909 down through Windows Server 2008 SP2).

There is no change to the monthly security updates (B release – Update Tuesday); these will continue as planned to ensure business continuity and to keep our customers protected and productive.

Now it appears that Microsoft has re-evaluated the public health situation and, in light of our great strides in defeating the pandemic, determined that the old ways should return.