WINDOWS AI NEWSAug 18, 20269 min read

KeyStarter Editorial Team

AI-assisted research & drafting, editorially reviewed

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01Copilot Apps Merge as Features Retire Today

The consumer Copilot and Microsoft 365 Copilot experiences merge into a single Microsoft Copilot app starting today, August 18, 2026, and the unified app retires Podcasts, consumer Deep Research, and Group Chat on the same date. Microsoft’s plan, reported by TechRepublic on August 14, 2026 and by ExtremeTech in the same week, brings the two product names under one app with a new icon. Business and enterprise access moves to copilot.cloud.microsoft, and the desktop version of the unified app is scheduled to arrive in mid-September.

For consumers, the practical effect is simpler and smaller at the same time: one app to open, but fewer experimental features inside it. Podcasts, consumer Deep Research, and Group Chat are retired today, so any workflow built on those features stops at the end of the day. Microsoft’s focus for the merged app is chat, work files, and agent-style tasks that carry across consumer and business accounts.

For businesses, the migration point is copilot.cloud.microsoft. Teams that bookmarked the old consumer or M365 URLs should update shortcuts and re-test prompts against the unified app before the mid-September desktop rollout. If Copilot is embedded in internal training or help-desk flows, budget a quick pass to confirm the new app returns the same answers.

02Copilot Notebooks Open Up to Plain Files

Copilot Notebooks now lets all users attach Markdown, RTF, and TXT files as reference sources, a change announced on August 13, 2026 and reported by Japanese tech media on August 17. The addition means Notebooks can ground answers in plain-text files without conversion. Previously, users could point Notebooks at documents and web pages in supported formats; the new support closes a gap for people who keep specs, meeting notes, or runbooks in lightweight formats.

For writers and analysts, this makes Notebooks more useful for daily research: attach a .md draft, an .rtf export, or a .txt log, and the notebook can reference the file when answering follow-up questions. For teams, it is a small but meaningful step toward treating Copilot as a document assistant rather than just a chat assistant, and it pairs with the broader consolidation of Copilot surfaces described above.

03Windows 11 Insider Builds Land With Emoji 17.0

Microsoft shipped five Windows 11 Insider builds on August 17, 2026 — two in Beta and three in the Experimental channel — headlined by Emoji 17.0 support and a new File Explorer right-click menu. The Beta channel received builds 26220.9209 (26H2) and 28020.2731 (26H1). The Experimental channel received 26340.9212 (26H2), 28120.2738 (26H1), and 29648.1000, the last of which targets a future platform. Microsoft also renewed the flight certificates that were expiring, replacing the situation that had affected flights after the August 11 expiry.

The most visible change is Emoji 17.0: pressing Win+. opens a picker with the new glyph set, which will eventually reach stable Windows. The Experimental channel also ships a rebuilt right-click context menu in File Explorer, part of the ongoing effort to modernize the shell’s legacy menus. These builds are explicitly experimental, so some features may change or disappear before general availability.

For Insiders, the takeaway is to test the new emoji picker and File Explorer menu and report issues through the Feedback Hub. For developers, Emoji 17.0 introduces new code points that applications should be prepared to render; font and text-measurement code that assumes the old emoji set is worth a compatibility pass.

04WMIC Removal and Recovery Networking Arrive in Insiders

The 26H1 Beta build 28020.2731 removes WMIC, while the Windows Recovery Environment gains the ability to reuse Wi-Fi profiles already saved by the main OS. WMIC has been deprecated for years, and its removal in the 26H1 Beta is the next step in Microsoft’s long-announced move to PowerShell. Scripts that call wmic.exe for hardware, service, or process queries need to be rewritten with PowerShell equivalents such as Get-CimInstance. The Experimental builds also add a camera roll backup entry and remove the drag-to-tray behavior, smaller shell changes that shipped in the same flight.

The WinRE network enhancement is more interesting for recovery scenarios. Windows Recovery Environment can now reuse the Wi-Fi configuration saved by the main operating system, which means an online recovery session can connect to the same network without re-entering credentials. That simplifies driver downloads, cloud account sign-in, and other recovery steps that previously required a wired connection or manual setup.

For IT teams, this is a two-part checklist. First, audit any remaining WMIC references in deployment, monitoring, and maintenance scripts and migrate them before the change reaches stable. Second, test the recovery flow on an Insider device: confirm that WinRE connects using the saved Wi-Fi profile and that provisioning packages still behave as expected.

05Edge 151.0.4129.86 Closes Six Flaws

Microsoft Edge 151.0.4129.86 for Stable fixes six security issues, including one Edge-specific autofill heap-overflow vulnerability rated CVSS 8.3. The update, released on August 14, 2026 and reported by Japanese tech media on August 17, closes five Chromium use-after-free flaws (CVE-2026-19556 through CVE-2026-19560) plus CVE-2026-72970, an Edge-specific autofill heap overflow that can lead to remote code execution. The build follows 151.0.4129.78, which was covered in the August 15 roundup; the new .86 build is the one that fixes the autofill issue.

The severity split matters: the Chromium use-after-free bugs require a malicious page to be opened, while the autofill overflow is rated 8.3 on the CVSS scale because a successful exploit can give an attacker code execution with the user’s privileges. Browsers apply patches automatically in many cases, but users on managed devices may need an administrator to approve the update.

The action is simple: update Edge to 151.0.4129.86 from edge://settings/help and restart the browser. Enterprises should stage the build, verify internal extensions still work, and prioritize the update for users who rely heavily on autofill for work credentials.

06Excel Adds Regex to XLOOKUP and XMATCH

Excel’s August 2026 update adds regex matching to XLOOKUP and XMATCH through a new Match Mode 3, plus REGEXTEST, REGEXEXTRACT, and REGEXREPLACE in Microsoft 365 and Excel for the web. With Match Mode 3, XLOOKUP and XMATCH can search using regular expression patterns instead of exact or wildcard matching, which removes a class of workarounds that used helper columns and nested functions. The three new REGEX functions let users test whether text matches a pattern, extract matching substrings, and replace matched text in place. IT Boltwise documented the change in August 2026.

The licensing caveat is important: the new regex features are rolling out to Microsoft 365 and Excel for the web only. Excel 2021 and Excel 2024, the perpetual-license editions, do not receive the functions. Teams standardized on a one-time purchase will not see Match Mode 3 or the REGEX functions even after the rollout completes, so the feature is effectively a subscription-era Excel capability.

For analysts, regex matching is a genuine upgrade for cleaning messy data: extracting order IDs, normalizing phone numbers, or validating code formats becomes a single formula instead of a chain of FIND and MID calls. For finance teams on perpetual licenses, the change is another data point in the Office 2021 vs Microsoft 365 decision, since AI features and newer functions keep landing on the subscription side.

07MDASH: Microsoft Tests Agent-Based Windows Hacking

Microsoft is internally testing MDASH, a system of more than 100 specialized AI agents that hunt for vulnerabilities in Windows, and it has already found several unknown critical flaws. Pro Networks reported on August 17, 2026 that MDASH is an early internal tool rather than a product. The system runs agent-based analysis across Windows components, effectively automating parts of the vulnerability research that human security engineers perform. The agents have already surfaced several previously unknown critical issues, which Microsoft routes into its internal bug and patch pipeline.

The security significance is forward-looking. If agent-driven hunting works at scale, Microsoft can find and fix classes of bugs earlier, before they appear in exploit chains or third-party research. That could shorten the gap between a vulnerability being introduced and it being patched, which is exactly where attackers profit today.

For users, MDASH is not something to install or configure; it is background infrastructure. For security teams, it is validation of a trend: autonomous agents are becoming part of defensive research, and organizations should expect both Microsoft and attackers to use similar tooling. The practical advice is unchanged — keep Windows and Edge patched, since the internal discoveries will surface as regular fixes.

08What This Means for Windows Users and IT Teams

Today’s changes divide into three actions: update Copilot workflows before the feature retirements, apply the Edge security fix, and audit WMIC and Excel formula dependencies. The Copilot merger is the headline because it is effective today. If your routine uses Podcasts, consumer Deep Research, or Group Chat, those features end today, and the unified desktop app is still weeks away. If your organization is on Microsoft 365 Copilot, confirm the move to copilot.cloud.microsoft and re-test the prompts that matter. Excel’s new regex functions are subscription-only, so check which license tier your team actually uses.

For Windows users: the Edge update is the fastest win — 151.0.4129.86 fixes the autofill RCE and five Chromium use-after-free bugs. Insiders can explore Emoji 17.0 and the new File Explorer menu, and anyone who still writes WMIC scripts should start the PowerShell migration now. Recovery workflows get easier over time as WinRE learns to reuse saved Wi-Fi profiles.

For IT teams: stage Edge .86, audit WMIC references, review Copilot shortcuts and business URLs, and test the recovery flow on an Insider device. On the licensing side, the Best Windows License Buying Guide 2026, the Windows 11 Pro vs Home guide, and the Windows 10 vs Windows 11 comparison cover the common paths as devices move toward builds that still receive features.

The through-line is consolidation and hardening. Microsoft is merging AI surfaces, retiring experimental features, modernizing Windows shell pieces, and using agents to find flaws earlier. Teams that map their Copilot workflows, browser updates, and scripting dependencies to these changes will be ready before the next wave lands.

FAQ

External References

• • Microsoft Learn: Windows 11 Insider Preview Build 26340.9212 (Experimental) release notes (Aug 17, 2026)
• • Microsoft Learn: Windows 11 Insider Preview Build 28020.2731 (Beta, 26H1) release notes (Aug 17, 2026)
• • cnBeta (via NetEase): Windows 11 Insider build roundup, WMIC removal and WinRE changes (Aug 17, 2026)
• • TechRepublic: Microsoft Copilot app merger details (Aug 14, 2026)
• • ExtremeTech: Microsoft merges Copilot apps, ditches the Mico mascot (Aug 2026)
• • Forest Watch: Copilot Notebooks supports Markdown, RTF, and TXT files (Aug 17, 2026)
• • Forest Watch: Edge 151.0.4129.86 security update closes six CVEs (Aug 17, 2026)
• • IT Boltwise: Excel August 2026 adds regex to XLOOKUP and XMATCH (Aug 2026)
• • Pro Networks: Microsoft’s AI tool finds Windows flaws before hackers do (Aug 17, 2026)

By KeyStarter Editorial Team
This article was compiled with AI assistance for research and drafting and has been editorially reviewed. All sources are listed above.

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