These drivers are for PPC2003. I have not tested them on Windows Mobile 5, but I have a hunch that they'll work fine. If you managed to test them out, let me know the result. A little background if you're interested:

Both WLI-CF-S11G and WLI2-CF-S11 wireless LAN cards are produced by Melco Inc., under the brandname BUFFALO. The WLI model was supported up to Windows CE 3 (PPC200 and PPC2002), and was then succeeded by the WLI2 model. The WLI2 model was introduced before the launch of PPC2003. Today, both products have long since been discontinued. An official driver for PPC2003 was never made available.

There are a few points of interests:

• First, PPC2003 was based on Windows CE .NET, which is really just Windows CE 4. The old drivers wouldn't work because the underlying OS has changed.
• Second, both WLI and WLI2 must be very similiar, so much so that the same driver is used for both adapters. The official driver for WLI2 specifically install support for both WLI and WLI2.
• Third, and most importantly, there is an official driver for Sigmarion III. Sigmarion III is a Japanese-market device with Intel PXA255 CPU and runs Windows CE .NET.

The Sigmarion III driver will not install on PPC2003 because the install package is keyed to "XScale CPU-only", whereas the PPC system is expecting "ARM CPU-only" package. Theoretically, it is possible that the Sigmarion III driver is optimized and uses some XScale-only instruction set, in which case the driver would fail on other ARM-compatible CPU. But I doubt there is any such optimization done.

And so the drivers that you see here are simply the Sigmarion III driver package re-marked to "ARM CPU-only", although I have changed a few other non-essential items. I think you can see why I'm calling this "official" driver. Remember, however, that these drivers are not supported by Melco. Also, the original package install support for both WLI and WLI2. I have decided to separate them, but the actual drivers are identical.

Note on comparison to Intersil Reference PRISM driver:

You've probably tried the reference driver. I did. The reference driver will not recognize the BUFFALO card, unless you manually created the pnp entry.

The "official" driver does not contain the control panel applet, or the tray app. It is supposed to work seamlessly with the OS. If you use the control panel applet, it might interfere with the built-in wireless card configurator. For example, assume that you're already connected to a network and you run the control panel applet. Upon closing the applet, it will try to use whatever configuration that happens to be selected at the time, possibly disrupting current connection.

The "Radio On/Off" option in the reference driver seems to work correctly, but power is always applied to the CF card regardless of the state of the radio. This option has never been available in Melco-supplied drivers.