My Mac says I need iOS 10.15 to get office 365 but idk where to find the update

Back up your data, check your applications for compatibility, and click on Catalina, Big Sur, or Monterey. Alternatively, switch to a product such as LibreOffice.

Catalina and newer won't run 32-bit software; download and use Go64 to scan for it. To check other programs, click here and look them up.

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What model/year Mac do you have?

What version of office 365 do you have?

You may need an update for Monterey.