I'm in the process of setting up a new Proxmox cluster, moving away from VMware. I was considering starting fresh with either Windows Server 2022 or 2025. I've heard mixed reviews, with some users recommending staying away from 2025 because of bugs, while others say that most issues have been sorted out since its release six months ago. I'm thinking of starting with 2022 and perhaps waiting until 2026 to upgrade. Also, I currently have licenses for 2019, but I don't have enough cores to support the new cluster. Can I mix different versions of core licenses, like using my 24 cores from 2019 and adding 8 cores of 2025? If I use 2025 and downgrade to 2022, can I even go back to 2019? Considering that 2019 will be supported until 2029, are there any downsides to sticking with it for a couple more years?
5 Answers
If you're setting up your Domain Controllers, definitely go for 2022 or even stick with 2019 if it's working for you. 2025 is still too unstable for critical roles.
I'd recommend sticking with Windows Server 2022 for now. Many folks are still facing issues with 2025, especially for Domain Controllers, so it's better to play it safe until those bugs are resolved.
From my experience, 2022 is significantly faster and more responsive than 2025, especially on less powerful hardware. I’d avoid 2025 until all the problems are sorted out.
Personally, I’ve set up a couple of VMs on 2025 without problems, but I’m mostly using 2019 and 2022 in production. If I were you, I’d wait a bit longer before jumping to 2025.
You can't mix core licenses across different versions on the same hardware. If you're using core licenses, you need to fully switch to 2025, and you'll have to get new Windows Server CALs as well.
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