What type of software includes a personal calendar, a to-do list with priorities, and contact management features?

A personal information manager is designed to help individuals organize and manage their personal and professional responsibilities efficiently. This type of software typically integrates several features necessary for day-to-day management, such as a personal calendar for scheduling appointments and events, a to-do list that allows users to prioritize tasks, and contact management functionalities that facilitate the storage and retrieval of important contact information.

By incorporating these components, a personal information manager helps users enhance productivity and stay organized. This makes it particularly valuable for anyone balancing multiple tasks and needing a centralized place for managing personal and professional information.

The other types of software listed do not serve the same purpose or provide the same combination of features, which clearly differentiates the personal information manager as the optimal choice for this particular query.