HTC One M8 User Manual page 296

296 Other apps
Managing task lists
1. In the Tasks app, tap
2. From here, you can:
Tap a list to show all tasks under that list.
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Tap
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You can't create lists for Microsoft Exchange ActiveSync accounts.
Tap
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Some lists can't be deleted.
> Manage lists.
and choose an account to create a list.
to rename or delete a list.