A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi,
You don't need to worry; if you have the lifetime version, you won't be affected. Some users received an alert, but as long as you meet the minimum requirements, you won't be affected.
Based on the information provided, your Mac will not be affected; the minimum requirement for using Office 365 is macOS Monterey (version 12), as described here.
If you are on version 16.91, you can rest assured.
Do you need help with anything else?
Thanks.