Realizing that a good amount of my time is spent on my Sprint PPC-6700, I recently started having problems w/ Activesync and my Small Business Server 2003 being overly friendly... Namely, the error code 0x85010014 continued to reoccur whenever it wanted.
Several items to remedy the issue:
1) Ensure that your ASP.net version is OK on your IIS 6 websites. Mainly, check out the Microsoft-Activesync-Server, Exchange, Exchweb, etc. for correct versions.
2) Ensure that your directory authenication/security is in line w/ default values. Please review the following for more information: http://blog.flaphead.dns2go.com/archive/2005/11/21/3202.aspx
3) Check here for a great fix that helped lock in the changes: http://support.microsoft.com/default.aspx?scid=kb;en-us;817379
After you hit all the open changes, try it again... So far, several hours from my fixes, all is working well again!
Best of luck!