Due to the fact that MyISAM is marked as deprecated, I checked which databases are still using MyISAM. I found a lot in the ISPConfig "dbispconfig" database. Is it safe to migrate to InnoDB or is MyISAM required for ISPConfig 3.2.10p2?
MyISAM is not required. The database/table type does not matter for ISPConfig. Newer installs use InnoDB by default.