I have one SBS2003 sp2 with exchange sp2 and a brand new SE Xperia X1 mobile phone.
Set up Xperia Outlook account using DYNDNS server adress.
Got error msg indicating that I needed a certificate.
Generated a new cert thru the CEICW wizard just in case, exported it and installed it on the Xperia
Now I'm getting error msg 0x85010004 when running the active sync app on the Xperia and SE X1 support says it is related to "faulty account settings".
When I ask them to be more specific they went hostile on me and told me I couldn't ask them about how to configure my Exchange server, which of course I never did... tum-de-dum...
There seem to be no public Xperia support code reference point.
Googled a bit on 0x85010004 and there seem to be several very different options on this one.