OneDrive Sync Support Ends for Pre-22H2 Windows 10 on August 15

Microsoft will stop servicing the OneDrive sync app on any Windows 10 build older than version 22H2 starting August 15, 2026, cutting off Files On-Demand, Known Folder Move and library syncing for machines that, in most cases, have not received a security patch since last October.

The cutoff sounds like a new blow. It is really the last domino. Windows 10 itself left Microsoft’s general support list on October 14, 2025, and the only version eligible for the paid or free Extended Security Updates (ESU) bridge that followed is 22H2. Every PC still parked on an earlier build, 21H2, 21H1, 20H2 or older, has been running without OS security patches for roughly ten months already. OneDrive was simply the last thread still tying those machines to Microsoft’s servers.

What Actually Breaks on August 15

The change was posted to Microsoft’s admin Message Center as advisory MC1426708 and applies specifically to the OneDrive sync client, the background service that mirrors files between a PC and the cloud rather than the OneDrive service itself. Microsoft’s own wording is careful: support ending is not the same as the app refusing to open.

This change aligns OneDrive support with the Windows lifecycle policy and helps Microsoft focus ongoing investments on supported operating systems.

That is the company’s official framing of the move. In practice, several everyday features stop being guaranteed the moment the calendar flips past August 15:

• Files On-Demand, which shows cloud files in File Explorer without storing them locally
• Known Folder Move, which redirects Desktop, Documents and Pictures into OneDrive automatically
• Offline file access for previously synced content
• Syncing of personal OneDrive, OneDrive for Business, and SharePoint or Teams document libraries

None of that vanishes overnight. Existing folders stay put and the web version of OneDrive keeps working regardless of what Windows build sits underneath it. What disappears is Microsoft’s obligation to fix anything that breaks. A future authentication change, a TLS update or a routine defect that only shows up on old builds will get a one line answer from support: upgrade.

A Deadline That Already Had a Prequel

This is not Microsoft’s first pass at these machines. Windows 10 version 21H2, the release immediately before 22H2, lost mainstream support back in 2023. Windows 10 as a whole reached its scheduled end of support on October 14, 2025, and Microsoft has been steering stragglers toward 22H2 ever since, because that is the only build the Extended Security Updates program will install on.

There is also a small, telling wrinkle in the advisory itself. Microsoft’s Message Center text reportedly refers to a cutoff for “Windows 10 version 22H1 and earlier,” but Microsoft never shipped a Windows 10 release by that name. The company moved to an annual cadence after 21H2, and 22H2, released in October 2022, was the final version. Administrators should simply read the notice as covering everything below 22H2. It is a minor slip, but a fitting one for a support wind-down that keeps catching people who assumed an old but familiar build would just keep working.

How Many PCs Are Still Running Pre-22H2 Windows 10?

A meaningful slice of the world’s PCs, likely in the hundreds of millions, are still on Windows 10 builds that predate 22H2 and have already gone without an OS security patch for the better part of a year. StatCounter’s version-share tracking put Windows 10 at roughly 28% of desktop Windows installs worldwide as of June 2026, down from a much larger share a year earlier, with Windows 11 accounting for most of the rest.

• 28.2% of desktop Windows PCs worldwide were still on Windows 10 in June 2026, versus 69.9% on Windows 11
• 21 percentage points is roughly how much share Windows 10 lost in the twelve months to June 2026, the steepest annual drop StatCounter has logged for any Windows version
• Hundreds of millions of Windows 10 machines are estimated to remain in use against a Windows install base Microsoft has put north of a billion devices

Not every one of those Windows 10 machines is stuck on a pre-22H2 build; many home users take feature updates automatically. But enterprises freeze feature updates for compatibility testing far more often than consumers do, and those are exactly the fleets most likely to be sitting on 21H2 or older with no ESU coverage and, as of August 15, no supported OneDrive sync either.

Microsoft Quietly Buys 22H2 Holdouts an Extra Year

While pre-22H2 machines lose their last safety net, Microsoft has been quietly making life easier for the people who did make it to 22H2. The consumer Extended Security Updates program was originally due to expire on October 13, 2026, one year after Windows 10’s official end of support. In late June 2026, Microsoft rewrote its own ESU documentation to push that date out by a further twelve months.

According to Help Net Security’s report on the change, Microsoft added the new October 12, 2027 date through an editor’s note on a Windows Experience Blog post rather than a formal announcement. “This extension provides customers with more time to transition to a new Windows 11 PC while continuing to receive critical security updates,” the updated post reads.

That quiet extension only helps machines already on 22H2, the same version required to enroll in ESU at all. Consumers can get it for free by backing up settings through a Microsoft account, by redeeming 1,000 Microsoft Rewards points, or through a one-time $30 purchase covering up to ten devices. Commercial customers pay per device through volume licensing, starting at $61 for the first year and doubling in each subsequent year. It is not available to a PC still sitting on 21H2.

The Free Upgrade Most Stragglers Skipped

What makes the pre-22H2 population’s situation harder to sympathize with is how small the ask was. Moving from 21H2 to 22H2 is a routine feature update delivered through Windows Update, not a hardware-gated leap like the jump to Windows 11, which requires TPM 2.0 and a supported processor that many older PCs simply don’t have. Anyone who let a Windows 10 machine sit on an old build for years skipped a free, low-friction update, not an expensive one.

That gap is showing up elsewhere in Microsoft’s own OneDrive roadmap. The company recently shipped a rebuilt sync engine for OneDrive on Mac, a piece covered in WinAddons’ report on OneDrive’s native Mac sync engine doubling transfer speed, showing where engineering effort is actually going while the Windows 10 tail gets trimmed. Leaving sync running on ancient builds is also a security liability of its own kind; a separate campaign detailed in WinAddons’ coverage of malware hiding inside Discord and OneDrive traffic shows attackers are already comfortable using legitimate sync channels as cover, a risk that only grows on endpoints running unpatched, unsupported software.

What Comes Next for Legacy Windows 10 PCs

For anyone still unsure which build they’re running, Settings, System, About will show the version number in seconds. Getting to 22H2 buys OneDrive sync through October 2028 and, with ESU enrollment, security patches through October 2027. Getting to Windows 11 buys the normal update path with no expiration date attached. Staying on 21H2 or older past August 15 buys nothing but a support call that ends in a request to upgrade.

Frequently Asked Questions

Will my OneDrive files disappear after August 15, 2026?

No. Files already stored in OneDrive stay in the cloud and remain accessible through the web interface at onedrive.com regardless of which Windows 10 build a PC is running. What ends is Microsoft’s guarantee that the desktop sync client will keep working reliably on pre-22H2 machines.

How do I check which Windows 10 version I have?

Open Settings, then System, then About, and look for “Version.” Anything reading 21H2, 21H1, 20H2 or 2004 falls under the August 2026 cutoff; only 22H2 is covered through October 2028.

Does enrolling in ESU also fix OneDrive sync?

ESU only covers OS-level security patches, not OneDrive feature updates or bug fixes, and it requires a device to already be on 22H2. A machine on 22H2 gets both the ESU security bridge and OneDrive sync support without needing a separate enrollment for the sync piece.

Can I keep using OneDrive without the desktop app?

Yes, though it is far less convenient than local sync. Files can be uploaded, downloaded and shared entirely through a browser, and Known Folder Move and Files On-Demand simply won’t be available.

Is upgrading from 21H2 to 22H2 the same as upgrading to Windows 11?

No. The move to 22H2 is a standard feature update installed through Windows Update with no new hardware requirements. Windows 11 requires TPM 2.0 and a supported CPU, which rules it out for a large share of the PCs still stuck on old Windows 10 builds.

What happens to OneDrive for Business and SharePoint sync specifically?

The same cutoff applies. The desktop sync client that powers personal OneDrive also drives SharePoint and Teams library syncing, so organizations running pre-22H2 fleets lose guaranteed support for all three at once, not just personal file sync.