I'm definitely not  suggesting there's an easy choice here. My (humble)
corporate experience in the matter, that does not deal with the
migration from Media Wiki , would point to FOSS Wiki (www.fosswiki.org)
but that's only an option, and it's a wiki I happen to use inside a
corporate environment (SMB) where text, text and more text with attached
documents has to be easy.
Best,
Charles.
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