Today’s Dev Channel flight advances Windows 11’s AI-driven productivity and accessibility story while changing how Microsoft numbers preview builds — Windows Insiders now get Windows 11 Insider Preview Build 26220.5770, delivered as cumulative content identified in Microsoft’s announcement and packaged under the update label Microsoft lists for the flight.
Background / Overview
Microsoft’s Windows Insider program continues to split work across parallel development tracks, and the Dev Channel now reflects active development for the next servicing stream. With this flight Microsoft incremented the major build identifier to Build 26220 for Dev‑channel flights, a divergence from the 26200 series used earlier in August; the company says this higher major build number will be used only for Dev Channel builds. This flight focuses on incremental but meaningful user-facing features — particularly new Click to Do text and Microsoft 365 integrations — plus accessibility additions (a Braille viewer) and share/find improvements in the Windows share window. The update is delivered via the standard Insider rollup mechanism and, as with recent flights, many experiences are being pushed via Controlled Feature Rollout (toggle-gated) so not every Insider will see all changes immediately. Microsoft’s documentation for the Dev Channel flights and the earlier August flights shows the same phased approach and the repeated use of toggles to accelerate or slow rollouts. Note: there is a small discrepancy in public tracking tables vs. Microsoft’s blog copy that merits attention — some third‑party build lists record the Aug 29 Dev flight under a different KB identifier than the one shown in Microsoft’s post. In practice, trust Microsoft’s official flight announcement for the canonical KB and build mapping; if you need absolute parity for enterprise tracking, verify the KB shown in Windows Update / Flight Hub on your device before mass deployment. (blogs.windows.com, blogs.windows.com, blogs.windows.com, blogs.windows.com, blogs.windows.com, blogs.windows.com, windowscentral.com)A small inconsistency observed in public trackers versus Microsoft’s blog concerns KB labeling for the Aug 29 Dev flight in some aggregator tables; the official Windows Insider blog entry should be considered the final authoritative record for KB and build mapping until Flight Hub/Windows Update shows the package on your device. (blogs.windows.com, blogs.windows.com, windowscentral.com)
Source: Microsoft - Windows Insiders Blog Announcing Windows 11 Insider Preview Build 26220.5770 (Dev Channel)
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