Your Web Browser
Horde groupware applications are designed to be accessible from many different
  types of Internet connected devices.  Any web capable device should be able
  to use the Horde groupware applications in some capacity.  This includes 
  conventional web browsers, PDA devices, and WAP enabled cell phones.
 
However, to be able to utilize the full functionality of
  the Horde groupware applications requires a web browser (e.g. Netscape or
  Internet Explorer)  capable of supporting 
  JavaScript and Cascading Style Sheets.  Most modern web browsers provide these
  capabilities. 
 
If JavaScript is not enabled, some Horde groupware application features may
  not work.
  Cascading Style Sheets are used for formatting and colorizing the pages.  It is highly
  recommended that you leave Cascading Style Sheets support enabled in your browser when
  using Horde groupware applications.
 
Even with supported browsers, you may notice minor variations in
  appearance depending on which web browser you use; this is normal.