For some stupid reason, Nokia decided to go with the .DER format instead of the industry-standard .CER format in S60 devices. Whoever the jackhole is at Nokia HQs who suggested that one should be publicly hanged and the video uploaded to YouTube. Talk about a pain-in-the-*** exporting from OS X's keychan to a bunch of .DER files and then BT transferring them over. Now I keep all those certs in a cert folder on my micro-SD card & on my computer in case I ever need to install them again. And I won't even go into the issues getting Nokia phones to connect to a Cisco 3000 VPN concentrator as those are pretty well documented now.