Open Office has been downloaded by millions of users all over the world, and it is an entirely free solution for creating, modifying, and sharing documents. It also comes with several add-ons that provide additional functionality and security features. For example, the Open Office Calendar is a great tool which provides the users with an easy way to manage their appointments. This calendar can be customized according to the user's needs and contains all the necessary information such as the start time, the total duration, the day of the week, and the date. Open Office is also compatible with third party applications such as QuickBooks. This enables the use of QuickBooks as a substitute for Open Office, which can save the user a lot of time and money spent on purchasing third party software.