Windows 11 26H2 vs. 25H2: Support dates and update changes

Windows 11 25H2 and 26H2 share the same core operating system files, and eligible PCs can move to 26H2 with a small enablement package. The practical difference is the later support deadline for 26H2, plus specific interface options Microsoft describes; the update also has prerequisites and a controlled rollout.

What changes between 25H2 and 26H2?

Microsoft says Windows 11 versions 24H2, 25H2 and 26H2 share a common core operating system and identical system files. For eligible PCs, the 26H2 enablement package activates capabilities delivered through monthly updates. It does not require a full operating-system replacement.

That shared servicing approach also means a feature described for 26H2 is not necessarily exclusive to the version switch. Microsoft distributes capabilities through monthly servicing, so the timing of individual features can vary.

Support deadlines depend on your edition

Microsoft’s supported-version table lists these end-of-updates dates:

Use the date for your installed edition when planning an upgrade. Microsoft’s servicing policy provides 24 months of support for Home and Pro feature releases and 36 months for Enterprise and Education. Moving to 26H2 shifts the listed end date later for both edition groups.

What an eligible PC needs to install 26H2

The supported upgrade path starts from Windows 11 24H2 or 25H2. The PC must also have the September 22, 2026 KB5124010 preview update, or a later cumulative update, installed. Applying the enablement package requires a restart.

Microsoft announced 26H2 availability on September 29, 2026, through a controlled rollout. Compatibility safeguard holds may delay the offer on devices with a known issue. When Windows offers the update, check Settings > Windows Update to see whether it is available for your PC.

Start menu and taskbar options Microsoft describes

Microsoft’s 26H2 documentation describes Start menu category and grid views, an adjustable menu size, and separate controls for the Pinned, Recent and All sections. It also describes taskbar placement at the bottom, top, left or right of the screen, plus a smaller taskbar option. Monthly servicing can deliver features before a version switch, so these capabilities are not necessarily exclusive to installing 26H2.

Microsoft also says built-in Sysmon and Administrator protection are off by default in 26H2. Installing the update alone does not turn them on.

When to move, and how organizations can plan

For a 25H2 PC, 26H2’s clearest practical benefit is a later end-of-updates date. If that longer support window matters, check the device’s edition and whether Windows Update offers the package. The documented interface controls may also matter to users who want to change the Start menu or taskbar, though monthly servicing affects when features arrive.

For an organization, Microsoft recommends deploying to a targeted group first and validating applications, devices and business-critical workflows before expanding rollout. That approach lets IT teams plan against the relevant edition deadlines while assessing the update in their own environment.