Windows 10, version 21H1 Release Updates

Created: 2021-02-25 |  Last Modified: 2021-07-19

Applies To: Direct Embedded / IoT OEM, Embedded and IoT Distributor, MAR, Named

This communication has been updated to include the Windows 10, version 21H1 - General Availability (GA) release date.

Updated May 26, 2021

This communication has been updated to announce the general availability date.

Updated April 06, 2021

This communication has been updated to provide Windows 10, version 21H1 Release candidate and RTM dates.

In the first half of the 2021 calendar year, Microsoft is planning to release to OEMs Windows 10, version 21H1. This communication provides additional information about the upcoming release and will be updated as more information becomes available.

Call to action

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Details

Important Upcoming Dates
Reminder: all dates and information in this communication shared under NDA.

Event
Date
Windows 10, version 21H1 - Feature Complete February 23, 2021
UCS Testing Begins February 23, 2021 – recommended but not required
UCS Testing Ends April 3, 2021 – recommended but not required
Windows 10, version 21H1 – Release Candidate April 21, 2021
Windows 10, version 21H1 - RTM April 27, 2021
Windows 10, version 21H1 - General Availability (GA) May 18, 2021
Windows 10, version 21H1 - Feature Complete
February 23, 2021
UCS Testing Begins
February 23, 2021 – recommended but not required
UCS Testing Ends
April 3, 2021 – recommended but not required
Windows 10, version 21H1 – Release Candidate
April 21, 2021
Windows 10, version 21H1 - RTM
April 27, 2021
Windows 10, version 21H1 - General Availability (GA)
May 18, 2021
Windows 10, version 21H1 - Feature Complete
UCS Testing Begins
UCS Testing Ends
Windows 10, version 21H1 – Release Candidate
Windows 10, version 21H1 - RTM
Windows 10, version 21H1 - General Availability (GA)

Windows 10, version 21H1

  • Version number. The version number will be “21H1”.
  • LCU: Windows 10, version 21H1 will be delivered as a LCU (Latest Cumulative Update) on top of Windows 10May 2020 Update (20H1) and Windows October 10, 2020 Update (20H2). This version will follow the same process as 20H2 for image updates, where OEMs may use the new 21H1 OPK media or use the Windows 10, version 2004 (“20H1”) RTM OPK and then add the latest 20H1 LCU, SSU, and 21H1 eKB to create their 21H1 preinstall images. UCS Testing. USC Testing is recommended but is not required.
  • Windows Release Adoption: The Windows 10, 21H1 will be considered recommended but not required for purposes of Licensing and Device Configuration Windows Release adoption requirements as outline in the Windows Price List and Product Terms and Jumpstart Device Configuration requirements.
  • OPK part numbers
Royalty Software Part Numbers
Part number
Description
X22-53938 SW DVD9 Win 10 21H1 64BIT English Home/Pro/SL/S/N OEM
X22-54598 SW DVD9 Win 10 21H1 ARM64 English Home/Pro/SL/S/N OEM
X22-54599 SW DVD9 WinHomeChn/WinHomeChn S 10 21H1 64Bit ChnSimp Home/Pro OEM
X22-54600 SW DVD9 WinHomeChn/WinHomeChn S 10 21H1 64ARM ChnSimp OEM
X22-53938
SW DVD9 Win 10 21H1 64BIT English Home/Pro/SL/S/N OEM
X22-54598
SW DVD9 Win 10 21H1 ARM64 English Home/Pro/SL/S/N OEM
X22-54599
SW DVD9 WinHomeChn/WinHomeChn S 10 21H1 64Bit ChnSimp Home/Pro OEM
X22-54600
SW DVD9 WinHomeChn/WinHomeChn S 10 21H1 64ARM ChnSimp OEM
IoT Software Part Numbers
Part number
Description
X22-54601 SW DVD9 Win 10 IoT Ent SAC High-End 21H1 64Bit English OEM
X22-54602 SW DVD9 Win 10 IoT Ent SAC Value 21H1 ARM64 English OEM
X22-54601
SW DVD9 Win 10 IoT Ent SAC High-End 21H1 64Bit English OEM
X22-54602
SW DVD9 Win 10 IoT Ent SAC Value 21H1 ARM64 English OEM
Supplemental Media Software Part Numbers
Part number
Description
X22-54603 SW DVD9 NTRL Win 10 21H1 32/64/ARM64 MultiLang Inbox Apps
X22-54604 SW Electronic Win 10 21H1 64BIT Feature Enblmnt Pkg OEM
X22-54605 SW Electronic Win 10 21H1 ARM64 Home/Pro/SL/S/N Feature Enblmnt Pkg OEM
X22-54603
SW DVD9 NTRL Win 10 21H1 32/64/ARM64 MultiLang Inbox Apps
X22-54604
SW Electronic Win 10 21H1 64BIT Feature Enblmnt Pkg OEM
X22-54605
SW Electronic Win 10 21H1 ARM64 Home/Pro/SL/S/N Feature Enblmnt Pkg OEM

Office OPK

  • There will not be an updated version of the Office OPK for 21H1. OEMs should preinstall Office OPK 20H2 with Windows 10, version 21H1.