As a basis there is a shared Microsoft Outlook data file (PST) used in a network. A local Microsoft Outlook Profile is enabled for the network which allows shared access to an Microsoft Outlook PST file. Contacts, appointments, tasks or mail receipt, central business-wide access to all Microsoft Outlook folders is possible with write and read access. Each employee can see who has which appointment or who is occupied with which task. In this central Microsoft Outlook you have all the functions of a "personal folder". Create, read or change items, search for items, handle items using the rules wizard. All the standard functions remain in the "Public Folder". All employees can use the same contacts. Networking with different versions of Microsoft Outlook can be achieved without any problems. The existing Microsoft Outlook network has not to be changed. Public ShareFolder is not a synchronization program and therefore does not put a strain on the network but rather it is its own "Store Provider" like Microsoft Exchange© Server.