If you use a Microsoft work or school account or a Microsoft-hosted account (e.g. Outlook, Hotmail, or Live.com) you can flag your emails and they will show up in To-Do. https://techcommunity.microsoft.com/t5/Microsoft-To-Do-Blog/Flagged-emails-come-to-Microsoft-To-Do/ba-p/366684
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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An error occurred while saving the commentChristian Elvang commented
Yes please add that option!