Since Mondo is a preview version, it can be prone to bugs that aren't present in the stable retail versions of Office.
If you are looking for a reliable office experience without the "Mondo" headache, consider these options: product key microsoft office mondo 2016
Understanding Microsoft Office Mondo 2016: The "Ghost" Version Since Mondo is a preview version, it can
A one-time purchase for those who hate subscriptions. Since Mondo is a preview version
If you don't want to pay for a license, LibreOffice or Google Docs provide almost all the same functionality as Office Mondo without the security risks of "cracked" keys.