Microsoft’s Office 2019 apps for Mac will stop working next month, because the company isn’t renewing a certificate that validates Office licenses. Owners of Office 2019 for Mac are being warned they’ll have to purchase Office 2024 or a Microsoft 365 subscription if they want to continue editing documents.

Microsoft previously promised that “all your Office 2019 apps will continue to function,” when it announced end of support in 2023. The company then quietly updated that support note last month to remove the mention of apps continuing to function, replacing it with “Rest assured that all your Office 2019 apps won’t lose any data.”

Starting on July 13th, Office 2019 for Mac and Office 2021 for Mac will both run in “reduced functionality mode,” allowing people to open files but not edit, save, or create new documents. The reduced functionality will impact Word, Excel, PowerPoint, Outlook, and OneNote.

While Microsoft is providing a certificate update for Office 2021 as it’s still supported until October 13th, 2026, the company is leaving Office 2019 for Mac users out in the cold as support for these apps ended a few years ago. “Office 2019 for Mac reached end of support on October 10, 2023, and no longer receives updates,” says Microsoft. “Because Office 2019 cannot be updated to the required version, this issue cannot be resolved by updating or reinstalling Office 2019 for Mac.”

JimmyTech points out that old versions of Microsoft 365 apps on Mac and iOS will also be affected by this certificate issue, but a simple update will fix it for those users.

Microsoft regularly ends support of software and there’s always the risk you could run into issues running older apps or versions of Windows. It’s still surprising to not see Microsoft make an exception here though, particularly because this certificate issue breaks the main functionality of an app you’ve paid a one-time license fee for.