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...
Source: [The Verge](https://www.theverge.com/news/947518/microsoft-office-2019-for-mac-end-of-support-no-edit)