ActiveSync is described as 'Data synchronization program developed by Microsoft for use with its Microsoft Windows line of operating systems. Originally released under the name "Handheld PC Explorer" in 1996, it provides users of Microsoft Windows a way to transport documents' and is an app in the office & productivity category. There are 2 alternatives to ActiveSync for a variety of platforms, including Mac, Windows, Linux, Web-based and Windows Mobile apps. The best ActiveSync alternative is Funambol, which is both free and Open Source.