"A Limited Edition version of the game was also released, including a cloth map of Enroth, a strategy guide and the first five games of the series on CD-ROM."
Source: Wikipedia, "Might and Magic VI: The Mandate of Heaven - Limited Edition", available under the CC-BY-SA License.
"Might and Magic VI: The Mandate of Heaven – Special Edition (1998), included Might and Magic games I, II, III, IV, V and the fanmade Swords of Xeen as well."
Source: Wikipedia, "Might and Magic VI: The Mandate of Heaven - Special Edition", available under the CC-BY-SA License.