According to https://confluence.atlassian.com/display/AOD/Migrating+from+Other+Issue+TrackersMantis isn't an option to import in the ondemand version of Jira.
Will this option ever become available?
Where could we vote for a feature like this?
Watch, follow and vote on https://jira.atlassian.com/browse/JRA-32485
But I think the answer for the foreseeable future is "import from Mantis on a development copy, then export that and import the bits you need into OnDemand"
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