Hi, no, it can't be upgraded to CE3 (HPC/2000), it however can be upgraded to CE2.11 (HPC/Pro), which is compatible with a wider array of WiFi Cards than CE2. Look for the upgrade chip in ebay
actually CE 2.0 supports more wifi cards you'd think all cards that have a "standard" (!) prism chipset should work... just a random example, a senao sl-2511 CF wifi ... (with a cf-pcmcia adapter in the pcmcia slot, or directly in the cf slot)