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If the certificate is expired wouldn’t the app just not launch at all? Why would it go into read only mode?
I'm assuming it's designed that way so that you'll be prompted to upgrade or buy a new license.

I finally deleted Word and Excel from my Mac today. Been installed on my Mac for 20 years. I'm not even sure what version it was. Don't care anymore. I've finally got rid of everything Microsoft on my Mac.
 
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I'm assuming it's designed that way so that you'll be prompted to upgrade or buy a new license.

I finally deleted Word and Excel from my Mac today. Been installed on my Mac for 20 years. I'm not even sure what version it was. Don't care anymore. I've finally got rid of everything Microsoft on my Mac.
If that’s the case that’s super scummy to blame it on an expired certificate
 
Microsoft Office 2019 for Mac will still open your documents after July 13, 2026 but you will not be able to edit, create or save files. This happens because Microsoft has ended support for Office 2019 so it can no longer get the updates needed to keep full features working. If you are using Office 2019 the best option is to upgrade to Microsoft 365 or Office 2021 so you can keep editing documents normally and continue getting updates in the future.
 
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