Please all follow the BMO guidelines and etiquette and keep to the technical aspect. The fact is that due some unfortunate circumstances Thunderbird was shipped offering the Exchange protocol via the Owl add-on to users that didn't need it. This has already partly been fixed, that is users of Hotmail/Live/Outlook accounts (with the exception of Outlook.com) will not be offered Exchange as default any more. We're working on further measures to fully rectify the situation, however, software has a release cycle and we can just ship a new version for every issue we encounter.
Bug 1592258 Comment 54 Edit History
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Please all follow the BMO guidelines and etiquette and keep to the technical aspect. The fact is that due some unfortunate circumstances Thunderbird was shipped offering the Exchange protocol via the Owl add-on to users that didn't need it. This has already partly been fixed, that is users of Hotmail/Live/Outlook accounts (with the exception of Outlook.com) will not be offered Exchange as default any more. We're working on further measures to fully rectify the situation, however, software has a release cycle and we can't just ship a new version for every issue we encounter.