Campaigns requires a Premium or Enterprise level plan
Campaign To-Do Tasks are available in Gmail
By default, Campaigns will show recipients in the order they are retrieved based on the date the recipient was added to the campaign. You’ll also be able to see the total number of tasks listed at the top of the Campaigns to-do list and sort by task type.
Note that Campaigns to-dos are only supported for Yesware for Gmail, and not currently supported in O365.