Après l'arrêt d'une offre Microsoft 365 gratuite pour les associations, des milliers d'espaces OneDrive ont été effacés des tenants Microsoft. À qui la faute ?

Le post Microsoft 365 : environ 171 000 associations auraient perdu leurs données OneDrive a été publié sur IT-Connect.

Thunderbird 154 active la prise en charge de Microsoft Graph pour les comptes Microsoft 365, à six semaines du blocage d'EWS. Le point sur les nouveautés.

Le post Thunderbird 154 active Microsoft Graph pour les comptes Microsoft 365 a été publié sur IT-Connect.

Microsoft Purview is expected to add retention-policy support for Planner tasks during August 2026, but administrators can already remove stale tasks with PowerShell. A tenant-wide Microsoft Graph script can find plans, filter old tasks locally, delete them safely, and email a cleanup report.

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A Microsoft Office file can reveal its author, revision history, internal project details, comments, or hidden content even when the visible document looks finished. For system administrators, the practical risk is greatest when Word, Excel, and PowerPoint files leave the organization—especially documents generated or managed through SharePoint and Microsoft 365 workflows.

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Microsoft has traced a Microsoft 365 search outage to a recent deployment that created resource-utilization problems, affecting Outlook, SharePoint Online, and OneDrive users in North America. The company deployed a fix, but continued load balancing and traffic redirection were needed to fully stabilize the affected infrastructure.

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A new Microsoft Graph PowerShell workflow can permanently remove matching notification messages from Microsoft 365 mailboxes in batches of 20, reducing network round trips during tenant-wide cleanup. It extends the JSON batching approach for large Graph tasks from account updates to destructive mailbox operations.

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Copilot Notebooks is rolling out support for Markdown, plain-text, and Rich Text Format files, allowing teams to import READMEs, runbooks, system logs, transcripts, and ticket exports without converting them first. The Microsoft 365 Copilot update makes the notebook more useful for incident response, project onboarding, and support analysis. Three formats expand notebook sources

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Microsoft will disable Excel’s COPILOT() function on September 14, 2026, ending its year-long test for Frontier and Insider customers. The function’s AI capabilities are not disappearing entirely, but users will need to use Excel’s Copilot side pane or Dynamic Action Button instead. Excel loses its worksheet AI function

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Microsoft Word for Windows and Mac now supports “Copy Link to Location,” creating cloud links that open a document at a specific piece of text or object instead of its beginning. The feature targets long-document reviews, but availability may vary as Microsoft rolls it out.

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Microsoft keeps Microsoft 365, Entra ID, and Azure services available, but does not promise to restore a customer’s data to a specific known-good point after an attack. That makes independent, immutable backup increasingly important as stolen identities let attackers reach mailboxes, files, cloud resources, and recovery controls.

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Microsoft Purview is the Microsoft 365 tool for finding sensitive information in work emails and files, and then warning or blocking you if you try to share it outside the company or with someone who should not receive it. Data Loss Prevention (DLP) is a feature inside Microsoft Purview that checks work emails, files, chats, and some AI prompts for sensitive information and can stop it from being shared improperly. Microsoft Purview is preparing to apply DLP and auto-labeling to Google Workspace, Box, Dropbox, Salesforce, and other non-Microsoft platforms, but the rollout requires connectors, enterprise licensing, and additional storage charges. Earlier Purview coverage focused on restricting external sharing in Microsoft 365.

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Microsoft confirms a bug in Classic Outlook for Windows that removes Copilot Chat and its entry points after build 20026.20182 or later, although some users may welcome the missing AI controls. Earlier Outlook coverage has tracked Microsoft’s broader feature and Copilot changes, including the planned automatic Copilot rollout.

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Microsoft is beginning the rollout of a unified Microsoft Copilot app for personal, work, and school accounts, replacing the separate Copilot and Microsoft 365 Copilot experiences. Microsoft previously outlined a broader Copilot super app for chat, coding, collaboration, and agents in earlier coverage, but this first step focuses on consolidating the existing apps and identities.

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Microsoft will stop delivering new Microsoft 365 features to Windows 10 after version 2608 arrives in August 2026, leaving affected devices on security-only updates until October 10, 2028. Microsoft previously announced that OneDrive sync support would end first on older Windows 10 releases; the new policy expands the pressure to move to Windows 11 across Microsoft 365 Apps.

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Microsoft is warning some Entra tenants that Conditional Access policies cover more users than their licenses allow, but the message does not trigger surprise billing or automatic policy removal. Microsoft’s licensing rules keep existing policies running even if an enabling license expires, giving organizations time to correct coverage or migrate.

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SharePoint Online now supports Microsoft Purview sensitivity labels for OneNote sections and MP4 video files, extending protection beyond traditional Office documents and PDFs. Administrators must enable the new file types separately, and OneNote requires an updated SharePoint Online Management Shell.

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Microsoft’s August 2026 Exchange Server security update permanently disables the legacy OWA Light client on every server that installs it. The release also leaves a known hybrid-deployment problem affecting messages sent from shared mailboxes, giving administrators two important post-update checks.

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Rapid7 and Microsoft have disclosed a SharePoint exploit chain that lets unauthenticated attackers impersonate users and execute code on vulnerable servers. The research used an AI agent extensively, but still required continuous expert supervision because the model produced unreliable results and exceeded its assigned boundaries.

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Exchange Online administrators will lose the “Other features” page in the Exchange admin center between September 2026 and February 2027. Microsoft says the change removes only a legacy navigation page—not the administrative tools linked from it—so teams should update bookmarks, documentation, and procedures before the rollout.

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