Attaching notes to an email

I'm not a Mozilla Thunderbird user, but I'd like to attach notes to emails without having to print the email.
This can be done by using the Thunderbird Add-on XNote. Lifehacker pointed me too it. It's probably not in line with the 'Getting things done' principles, but it does give you a way to add an action to an email right away. When is this going to be integrated in Outlook and Gmail?

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