Ok, here is how to *really* make the WCF12 from Linksys work with PocketPC 2003 (aka Windows CE 4.2):
1. Open the package, DO NOT PUT THE CF ADAPTER INTO YOUR PocketPC!
2. Install the driver from the CD (it says Setup Wizard 1.05 on my original CD). DO NOT PUT THE CARD INTO YOU PocketPC! (this driver, by itself, doesn't work - but it is REQUIRED that you install it first)
3. Now get the beta driver from Linksys
Beta drivers from Linksys
4. Extract them to a temp directory, go to that directory and run the SETUP program from there. It will appear to kinda sorta install, but the Active Sync setup part (the part where PocketPC apps actually get copied over to the PocketPC) won't run. It'll seem like a 'broken' install - but it isn't! There are in fact new drivers being copied to your PocketPC even though you can't see it happening! However, if you don't complete step 2 from above, this step does absolutely nothing for you! It *will not work* if you don't do number 2 above).
5. NOW go ahead and insert the WCF12 into your PocketPC and you should be good-to-go! Including the true Linksys Wireless Configuration Utility! Yippee!