Buckman, I have now got my hands on a Chromebook and tried to get MS Outlook from Google's Play Store, I did not try Outlook 365 as I have no account there to use.
MS Outlook as an App is not available, though various "clones" appear to be, though I did not explore these.
What flags up is the image shown. Using the Chrome browser and logging in to MS Outlook, MS's web site as stated works fine for each single MS account. Accessing multiple email accounts will present some challenges if that is needed. Accessing Google mail accounts is an embedded feature with Chromebook OS, so that is very easy.
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