I believe that it isn't compatible with Mac OSX. I've tried with no success. I thought I saw a link on their website that said this.

This comes from Avantgo's site!

Device Requirements




Note: The absence of a particular device from this list does not mean that it is incompatible with AvantGo; it simply means that it has not been tested.




Palm: Palm OS Version 3.x or later running on the following devices: Palm III, Palm IIIx, Palm IIIe, Palm IIIc, Palm V, Palm Vx, Palm VII, Palm m100; Handspring Visor; Symbol SPT 1500, 1700; TRG Pro; Sony CLIE.
Memory Requirements: At least 428KB of free memory, plus additional space for data.




Windows CE: Version 2.x or later using SH3, MIPS, or ARM processors, running on the following devices: Casio Cassiopeia 2400, E10, E100; Compaq Aero 2100, 1500; Philips Nino 500, Velo 500; HP Jornada 420, 680; Sharp Mobilon Pro 5000.
Memory Requirements: 605KB-920KB of free memory, plus additional space for data.




Pocket PC: Windows CE version 3.0 or later using SH3, MIPS, or Strong ARM processors, running on the following devices: Compaq IPAQ, Casio Cassiopeia E115, Jornada 540 Series.
Memory Requirements: 605KB-920KB of free memory, plus additional space for data.





Symbian OS Series 60 Mobile Phones: Symbian OS running on the following mobile phones: Nokia 3650, 7650.
Memory Requirements: At least 1200KB of free memory, plus additional space for data.




Desktop Requirements




Operating systems: Windows 95, 98 or NT 4.0 (NT4.0 users require service pack 3); Macintosh OS 8.5 or later (Palm only).




Browsers: Windows: Netscape Navigator 6.0 (or greater), or Microsoft Internet Explorer 4.0 (or greater). Macintosh OS: Netscape Navigator 6.0 (or greater), or Microsoft Internet Explorer 4.5 (or greater).




Software: Palm: HotSync Manager 3.0 (or greater). With Macintosh OS desktop (Palm only): HotSync 2.6.1 or greater. Windows CE: ActiveSync 3.0 or greater. Pocket PC: ActiveSync 3.1 or greater. Symbian OS Series 60: PC Suite for Nokia





Connectivity: Symbian OS Series 60: Requires IR or Bluetooth connectivity to an Internet-connected laptop or desktop computer