ActiveSync is a synchronisation program eveloped by Microsoft. It allows a mobile device to be synchronized with either a desktop PC, or a server running FirstClass Collaboration Suite, Microsoft Exchange Server, PostPath Email and Collaboration Server, Kerio MailServer, Zimbra or Z-Push. Only Personal information manager (PIM) data (Email/Calendar/Contacts) may be synchronized with the Exchange Server. (Tasks may also be synchronised with Exchange Server on Windows Mobile 5.0 devices.) The PC synchronization option, however, allows PIM synchronization with Microsoft Outlook, along with Internet "favorites", files, and tasks, amongst other data types. Supported mobile devices include PDAs or Smartphones running Windows Mobile, or the Windows CE operating system, along with devices that don't use a Microsoft operating system, such as the Symbian and iPhone platforms. ActiveSync also provides for the manual transfer of files to a mobile device, along with limited backup/restore functionality, and the ability to install and uninstall mobile device applications.