At the moment, only personal Microsoft accounts using an Outlook.com domain are able to sync between Microsoft To Do and Outlook 2016. If your personal Microsoft account uses a domain such as @outlook.com, @hotmail.com, @live.com or @msn.com, then your tasks should sync automatically between Microsoft To Do and Outlook 2016 on Windows.
However, if you’re using a personal Microsoft account registered to a different domain, like @gmail.com or @yahoo.com, your tasks won’t sync automatically. To sync your tasks between Microsoft To Do and Outlook 2016, you’ll need to a create a new alias for your account by registering a new outlook.com email address.
To create a new alias for your account:
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Under Account alias(es), select Add email.
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Select the option to Create a new email address and add it as an alias and enter what you want for your new @outlook.com address.
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Select Add alias.
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Once the new alias has been added to your account, just select the option to Make primary.
Now that your new @outlook.com address is the primary alias for your account, you’ll need to update your Microsoft account within Outlook 2016:
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Remove your initial Microsoft account.
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Head to File > Add Account to add your new @outlook.com email address as a Microsoft 365 account to Outlook 2016.
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Enter your new @outlook.com email address, then select Connect. (Alternately, you may need to enter your name, email address, and password and then select Next.)
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If prompted, enter your password and then select OK > Finish.
Your tasks should now sync between Microsoft To Do and Outlook 2016 automatically.