Microsoft rolled out Windows 11 Insider Preview Build 26300.8687 to the Experimental channel on June 12, 2026, delivering a trio of long-awaited improvements. File Explorer tabs get a much-needed overhaul, Windows Update becomes a single, streamlined experience, and search across the operating system finally feels fast and reliable. This build is part of a gradual rollout, so not every Insider will see the changes immediately.

File Explorer tabs grow up

When Microsoft first introduced tabs in File Explorer back in 2022, the reception was mixed. The feature worked, but it lacked the polish power users expected. Build 26300.8687 addresses several longstanding gripes.

Tabs can now be reordered by dragging them left or right, just like in a web browser. A new right-click menu on each tab offers options to close other tabs, close tabs to the right, or move a tab into a new window. You can also middle-click a folder to open it in a new tab—a small change that eliminates countless extra clicks throughout the day.

More consequential is the addition of tab persistence. After a restart, File Explorer can optionally reopen all the tabs you had open before signing out. A new setting under Folder Options lets you toggle this behavior. In tests, session restore works reliably even with multiple windows and dozens of tabs.

Under the hood, Microsoft has reworked how File Explorer manages memory for each tab. Before this build, every tab ran inside the main explorer.exe process. Now, tabs can optionally run in separate, sandboxed processes. The default setting keeps everything in one process for performance, but advanced users can flip a switch in the settings to isolate tabs. The benefit is tangible: if one tab hangs on a slow network share, you can close it without crashing the entire Explorer window. Microsoft says this change also paves the way for future extension support, though no timeline was provided.

Other small touches include a visual indicator when a tab is playing audio (for folders with media files), and the ability to set a custom background color per tab to distinguish production folders from test directories. These quality-of-life additions make File Explorer feel more like a professional tool rather than an afterthought.

A unified Windows Update experience

Windows Update has long been a patchwork of separate sections: quality updates, feature updates, driver updates, and optional updates all lived in different corners of Settings. Build 26300.8687 yanks them together into a single, coherent page.

The new "Update history" pane shows every update—cumulative, feature, driver, and definition—in one chronological list. Each entry includes a clear description, KB article link, and installation status. You can filter by update type or search for specific KB numbers.

More importantly, the update download and install flow now handles dependencies intelligently. When you check for updates, Windows scans for all applicable updates at once and presents a unified install button. The system calculates the optimal order and reboots only once at the end if multiple updates require a restart. During internal testing, Microsoft says this cut total update time by up to 40% on some configurations.

Driver updates get a major overhaul too. Instead of relying solely on Windows Update for drivers, the new system integrates directly with the Device Manager and the manufacturer-suggested driver list. If a driver fails to install, the update history now shows a clear error code and a "Retry" button. For advanced users, there's a new "Driver Update Preferences" section where you can choose between automatically installing drivers from Windows Update, using only drivers from your OEM, or being asked every time.

The quality-of-life improvements extend to Group Policy and MDM. IT administrators gain finer control over deferral periods, active hours can now be set per device rather than per user, and update notifications are more granular. A new policy allows organizations to force a reboot after a specified number of days with no user interaction, reducing the number of vulnerable unpatched machines.

Search that actually finds things

Windows Search has been a sore spot for years. With Build 26300.8687, Microsoft is rolling out a revamped indexing engine that dramatically speeds up results and expands the scope of indexed content.

First, the indexer now supports live updates for file content changes. When you save a Word document, its contents are immediately available in search—no more waiting for a re-index cycle. This works for all file types that the indexer understands, including PDFs, text files, and OneNote pages.

Cloud search gets a boost too. The built-in search box in File Explorer and the taskbar now pulls results from OneDrive and SharePoint simultaneously, displaying them alongside local results. Microsoft says the cloud results are now returned in under one second for 90% of queries, up from three to five seconds in previous builds. A new "Search across work and web" toggle lets you include or exclude organizational data from your results.

For power users, the search syntax expands with operators like datemodified:today, size:>100MB, and kind:=email. A new query builder UI (accessible by pressing / in the search box) helps you construct complex queries without memorizing syntax. The builder provides dropdowns for file type, date ranges, locations, and property filters.

The taskbar search experience has been streamlined as well. Search highlights and daily trivia now remain but can be dismissed permanently with a single toggle. The search box can be resized, and results flyout now shows recent files, installed apps, and web suggestions in separate, clearly labeled sections. Performance improvements mean the flyout appears in under 100 milliseconds on most hardware, eliminating the noticeable lag that plagued earlier versions.

Under the hood, the SearchHost.exe process uses 30% less memory and CPU, thanks to better caching and batched queries. This should address long-standing complaints about search indexing killing laptop battery life and hogging resources during heavy use.

Gradual rollout and what it means

Build 26300.8687 is labeled an "Experimental Preview," meaning features are delivered via controlled feature rollout to subsets of Insiders. Microsoft uses this approach to gather targeted feedback before wider distribution. If you're in the Experimental channel, you can check if the features are available by looking for the new Features drop-down in Windows Update settings, which shows which gradual rollouts are active on your machine.

If you don't see the changes yet, there's no way to force them—Microsoft enables them on the server side. The company typically takes one to two weeks to roll out features to all Experimental channel Insiders, assuming no major bugs surface.

This build also marks a shift in how Microsoft communicates Insider changes. Instead of detailed blog posts for every build, the team now surfaces feature announcements directly in the Feedback Hub and a new "What's New" card on the Windows Update page. That card includes a link to the Insider blog for those who want deeper technical dives.

Known issues and the road ahead

No public list of known issues accompanied this build, but early Feedback Hub reports suggest some rough edges. A handful of Insiders report that Explorer tab restore sometimes fails when waking from hibernation. Others note that the unified update page doesn't correctly reflect the installation state of some optional drivers. Microsoft has acknowledged these in forum responses and promises fixes in the next cumulative update.

The bigger picture: these features are unlikely to arrive in the general release of Windows 11 until at least the fall 2026 update, given the typical testing cadence. However, the unified update experience is expected to hit the Beta channel within a month, suggesting it's on a faster track. Enterprise customers should start evaluating the new update policies now, as they will simplify patch management significantly.

How to get the build

If you're already in the Experimental channel, check for updates in Settings > Windows Update. The build will download and install automatically. If you're not yet an Insider, join the Windows Insider Program at Settings > Windows Update > Windows Insider Program, select the Experimental channel, and reboot. Note that the Experimental channel may receive builds with more bugs than the Dev or Beta channels, so it's best to install it on a secondary device.

For those who prefer to wait, the features will eventually trickle down to more stable channels. File Explorer tab improvements and the unified update experience are considered "feature complete" for this milestone, but Microsoft will continue refining them based on feedback.

The strategic significance

These changes aren't just fluff. File Explorer tab persistence and isolation address real productivity pain points for knowledge workers and developers. The unified update experience tackles decades of fragmentation that has made managing Windows updates a headache for IT pros. And the search overhaul finally brings Windows closer to the speed and accuracy of third-party tools like Everything or Spotlight.

Microsoft is clearly investing in the fundamentals—the core shell, update mechanics, and search infrastructure—after years of chasing UI trends. Build 26300.8687 suggests a maturing Windows 11 that's less about visual novelty and more about hardening the bones of the OS. For longtime Windows users, that's a welcome development.