1. I've created a certificate and installed it on the SBS2003 server, no problem
2. I've exported the certificate in DER-format, and put it up on a web server with correct MIME-types (actually tried both .der and .cer-suffixes)
3. The certificate downloads and installs correctly with IE6, IE7, Firefox 2 and with IE on Windows mobile 6 - ergo the certificate seems OK

4. Downloading it onto an E90 with the internal web browser: 'File corrupt!' (both .cer and .der variations)
5. Sending it via bluetooth to the E90, shows up in Messaging, and generates a 'Feature not supported' message

AAAAAARGHHHH!

Help, please?