If you have enabled the ‘Flagged email’ option from settings in To Do, then any email you flag in Outlook will show up under the ‘Flagged email’ smartlist.
From the Outlook web app, you can create a task out of an email by right-clicking —> Advanced actions —> Create task. You can also select a message in the body of an email and create a task out of it.
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1. I would like To Do to be properly integrated with the desktop version of Outlook, in preference to the web version (which I don't use)
2. I would like to be able to attach emails to To Do tasks - turning emails into To Do items is all very well, but most of my tasks have multiple emails associated with them: I need to be able to have one task with multiple emails attached to it. For me, this is the single most frustrating aspect of To Do.