After many years of dithering I have finally made the leap to a Mac. Why did I wait so long?? I have a home wireless network which runs on a Microsoft Wireless Base Station MN-500 which has up-to-date software running. My problem is that my Airport Extreme card connects happily if WEP is disabled but does not connect if either 64-bit or 128-bit encryption is running. I have tried changing my base station channel from the default 6 down to 1 and right back through to 11 but the Airport Extreme will only connect if WEP is disabled. I cannot find any help through the FAQs. Can anyone offer assistance as, though I like my neighbours I do not want to give them access to my network and then my computer files.