Here¡¯s the link. You need to select the Mac OS tab. Note also that the insider versions of Outlook for Mac (in the fast ring) offer a chance to try a new user interface that differs greatly from that of the production releases. However, the new user interface doesn¡¯t yet offer all of the features of the old one, which is why it isn¡¯t the default yet. You may wish to try it if you¡¯re dissatisfied with the older version.
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Outlook for Mac works relatively well with Voiceover.