The most popular Operating system among Personal Digital Assistants is WinowsCE by Microsoft. WindowsCE is a slimmed down version of Windows 95. It as about the same look as Windows 95 but is lacking some of the features that users are used to having on their desktop machines. This is to be expected due it's size. The OS has the familiar start button and menus and allows for navigation either through the use of a pen or your finger.
Software compatibility is another issue.
There is all sorts of software you can get for a PDA that will allow your PDA and PC into interact. For example, IBM Mobile Net Connect provides a PDA with universal access over any existing wireless or Internet service to facilitate instant access to information. This is a great feature for business people that need to access to such things as inventory. Mobile net provides the ability for direct synchronization with business databases, and bi-directional communication. This allows users to read, change current information in the corporate database, as well as create new information to be stored on the database.