Since Mondo is a preview version, it can be prone to bugs that aren't present in the stable retail versions of Office.
Most instances of Mondo 2016 found today are activated via KMS (Key Management Service) scripts. These are typically used by organizations to activate many computers at once.
It was never sold to the general public in stores or via official digital downloads. How Product Keys for Mondo 2016 Work product key microsoft office mondo 2016
Because Mondo 2016 is a trial/preview version, its licensing works differently than a standard retail key you’d buy for Office 2021 or 365.
Many sites offering "free" Mondo keys require you to download "KMS activators." These files often contain malware, miners, or trojans that can steal your data. Since Mondo is a preview version, it can
There are "Generic Volume License Keys" (GVLKs) available publicly, but these only work if you have a KMS host server to validate them. Why You Should Be Cautious
It essentially contains the "everything" package—including features from Pro Plus, Visio, and Project. It was never sold to the general public
Contrary to popular belief, "Mondo" isn't a retail version of Office. It was originally a or an internal testing version used by Microsoft developers and early beta testers.