If you meant Microsoft 365 Apps version 2412 (build number), that build does not exist yet because 2024 is in the future. If you have actually seen a file labeled Microsoft Office Professional Plus 2021-2024 V2412 Build, it is likely malware, a fake, or a pre-release unofficial build – do not install it.
Would you like instead:
Microsoft has finally pushed the Fluent Design System fully into the LTSC branch. The sharp, utilitarian edges of Office 2016 and 2019 are gone, replaced by soft, rounded corners and a depth effect that makes the ribbon look like it’s floating slightly off the page. Microsoft Office Professional Plus 2021-2024 V2412 Build
It sounds minor, but when you stare at a spreadsheet for 8 hours, the softer UI is genuinely easier on the eyes. The dark mode is also significantly improved in v2412, no longer looking like a high-contrast hack, but a legitimate, sleek interface. If you meant Microsoft 365 Apps version 2412
If you are an IT manager running Office Professional Plus 2021, updating to the V2412 Build is not optional—it is a security imperative. The original release of Office 2021 (Version 2108) is now three years old. Attackers have had three years to reverse-engineer its defenses. Microsoft has finally pushed the Fluent Design System
The December 2024 update (Build 2412) patches 12 CVEs, including:
Furthermore, the V2412 build enforces TLS 1.3 by default for all cloud connections, deprecating the insecure TLS 1.0 fallbacks present in the original 2021 gold build.