In Outlook, what are items you create to track until completion called?

The term used in Outlook for items you create to track until completion is "Tasks." Tasks are specifically designed for tracking activities that need to be accomplished by a certain deadline. They allow users to set due dates, prioritize, and include additional information related to the task, such as notes and checklists. This functionality supports effective time management and helps ensure that important activities are not overlooked.

In contrast, reminders serve to alert users about upcoming events or deadlines but do not track the progress of tasks. Events are used to mark calendar occurrences such as meetings or appointments and do not inherently track completion status. Contacts are used for storing information about people and organizations and are unrelated to task management. Thus, the focus on the tracking capabilities and organizational features unique to "Tasks" clearly defines why it is the correct choice in this context.