Public OutLook is a program to make it possible for several users to connect to an Outlook-PST file at the same time. The shared Outlook-PST files have full access and rights for read and write. To share contacts, calendars, inboxes, or tasks is an important function of groupware solutions. Normally it is not possible without an MS Exchange server to use Microsoft Outlook together in a network. Public OutLook uses a common Outlook data file: PST. This program shares not only contacts or dates, it shares the whole Outlook PST file. All co-workers can use the same contacts. All built-in functions are preserved in the Public Folder. The existing Outlook network does not have to be modified. Public OutLook is not a synchronisation program; it is a store provider like MS Exchange Server.