Microsoft 365 Certificate Deadline: What Every IT Team Needs to Know Before July 2026

The blog content in markdown

The Clock Is Ticking on Microsoft's Certificate Update

If your organization runs Microsoft 365 on Mac or iOS devices, you need to add a calendar reminder: July 13, 2026. That's when Microsoft will flip the switch on a new licensing certificate for its productivity suite. Apps running outdated versions won't suddenly stop working entirely, but they'll enter what Microsoft calls "reduced functionality mode"—meaning users can open and view files but won't be able to edit, save, or access the full feature set.

For most businesses, this is a manageable maintenance window if you start planning now. But if you're running a fleet of unmanaged or semi-managed Apple devices, the post-deadline morning could get... interesting.

Why This Is Happening

Microsoft uses digital certificates to validate Microsoft 365 licensing. The current certificate expires on July 13, 2026, and Microsoft is renewing it as part of routine infrastructure maintenance. This isn't a security patch or a response to any vulnerability—your data isn't at risk, and no malicious activity is involved. It's simply a licensing housekeeping item that requires app updates to resolve.

The good news? If your devices are running reasonably current versions of Microsoft 365 apps, you're already covered. The new certificate comes bundled in app versions 16.83 and later for macOS, and version 2.93 and later for iOS.

What Devices Are Affected?

This update specifically targets managed macOS and iOS devices. Windows and Android devices are in the clear—they use a different certificate mechanism entirely.

Here's the breakdown:

• macOS devices running Microsoft 365 apps earlier than version 16.83
• iOS/iPadOS devices running Microsoft 365 apps earlier than version 2.93
• Devices running operating systems too old to support the required app versions

You'll also need to verify that devices are running at least macOS 12 (Monterey) or iOS 17.0 as baseline operating systems. If a Mac is still chugging along on macOS 11 Big Sur or earlier, it won't be able to run a Microsoft 365 version with the new certificate.

Your Action Plan: Three Steps to Compliance

1. Audit Your Device Fleet

Before pushing any updates, you need visibility. Check your managed device inventory for:

• macOS devices with Microsoft 365 versions below 16.83
• iOS devices with Microsoft 365 versions below 2.93
• Devices running operating systems that can't support the minimum required versions

If you're using Microsoft Intune, the Discovered Apps report gives you a cross-fleet view of installed versions. For Configuration Manager environments, software inventory or compliance baselines can surface this data. If you're managing devices manually, you can check individual app versions by opening any Microsoft 365 app and selecting About [App Name] from the menu bar.

2. Deploy the Updates

For most organizations, this is straightforward—push the latest Microsoft 365 updates through your existing management tools:

• Microsoft Intune: Use app update policies targeting your macOS and iOS devices. For Macs, MAU (Microsoft AutoUpdate) policies handle deployment. For iOS, standard App Store update management applies.
• Configuration Manager (SCCM/MECM): Deploy the latest Microsoft 365 package to co-managed Mac devices through your software distribution workflows.
• Standalone MAU: If your organization relies on MAU preferences rather than an MDM, ensure automatic updates are enabled, or trigger a manual update cycle using the msupdate command-line tool. Running msupdate > install from terminal will pull the latest available versions for all Microsoft 365 apps.

3. Handle the Stragglers

Some devices in your fleet might be too old to run the required app versions. For these:

• Upgrade the operating system if hardware permits—bump that old Mac up to Monterey or later.
• Plan a hardware refresh if the device can't support a modern OS.
• Lean on the web as a stopgap. Microsoft 365 for the web (accessible at microsoft.com) provides browser-based access to Word, Excel, PowerPoint, and more. It's included with all Microsoft 365 subscriptions and requires no installation.

Don't Let This Sneak Up on You

Here's the thing about certificate expirations: they don't announce themselves with dramatic warnings. One morning, users will open Word, try to edit a document, and find themselves staring at a frustrating "limited functionality" message. That's a preventable support ticket storm.

Six months is a comfortable runway, but it's not infinite. If your organization has dozens or hundreds of Apple devices, inventory assessments and update rollouts take time—especially if testing is part of your change management process. Starting now puts you well ahead of the curve.

The Bottom Line

Microsoft 365's certificate update on July 13, 2026 is a maintenance event, not a crisis—but only if you're proactive. Update your apps, verify compliance, and handle the few legacy devices that can't be updated. Your users won't skip a beat, and your IT team won't spend July 14th fielding panicked help desk calls.

Staying on top of updates is just good digital hygiene—whether it's your productivity suite, your hosting environment, or your domain certificates. Need help with the infrastructure side of things? NameOcean has you covered with SSL management and cloud hosting solutions built for modern workflows.