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The equivalent add-in feature is supported by the following platform and applications. COM add-ins can't be installed on any other platform, so on those platforms the manifest element that is discussed later in this article, EquivalentAddins, is ignored.
Excel, Word, and PowerPoint on Windows (Version 1904 or later)
Classic Outlook on Windows (Version 2102 or later) against a supported Exchange server version
Exchange Online
Exchange 2019 Cumulative Update 10 or later (KB5003612)
Exchange 2016 Cumulative Update 21 or later (KB5003611)