2Xel, how many planets do you actually know about in the Might and Magic universe?

The planets mentioned in the games are: Axeoth, the Enroth Colony, Ardon, Xeen, Terra, and two worlds destroyed by the Krigans (Fire Moon and the one in Might and Magic 4, although it's possible these are the same). Artificial world-ships: VARN 4 (Might and Magic 1), VARN MXMIV (colonized Enroth, see Might and Magic 6), VARN 6 (dropped by Sheltem onto a star), CRON (a ship carrying VARN, with an elemental-created biosphere inside, similar to some VARNs). Also, in Jerry Graveland's books, there is a world called Axeoth. In Heroes 4 and Might and Magic 9, it's not the same Axeoth, but many elements from Graveland's books are used (for example, the concept of "gods").

2Xel, how many planets do you actually know about in Might and Magic... and I'm also interested in your opinion about the ZIP (Zealots of Inherent Purity) – what happened to them?

The reason we never found out is as follows. First, the cancellation of Ashes of the Avowed with Forge, where the dark ZIP were the main villains. Second, 3DO needed to make money to get out of the crisis by giving the series a "new plot twist" – The Reckoning and moving the action to Axeoth. Castor and his followers may have ruled Deia after their plans failed in Might and Magic 7, or they disappeared somewhere. The other half of the ZIP, led by Rezurectra, continued to serve as advisors to Gavin Magnus and traveled to various worlds using the Web of Ancient Worlds (the light ending of Might and Magic 7), hoping to find them somewhere. In Ashes of the Avowed, there is a dream Gelu has (the last map), where he dreams of a woman who is very similar in description to Rezurectra. But this storyline was not meant to be developed because of The Reckoning. What happened to the ZIP after The Reckoning remains unknown (probably due to 3DO's bankruptcy and the subsequent mess in the form of Ashan). Perhaps the ZIP (and maybe the lords of Harmondale) were on Beta-5 station during the cataclysms of The Reckoning.