https://forums.microsoft.com/windowsmobile/ShowPost.aspx?PostID=2760467&SiteID=65
I registered two DLLs (per another thread) as follows:
*
RegSvr32 OLE32.DLL
*
RegSvr32 MSRDO20.DLL
These can be registered either from START / RUN or from a CMD prompt.
After I reregistered these DLLs I then synced again and so no change. So I once again removed the CHECKBOX from within the ActiveSync program (TOOLS / OPTIONS) from the CONTACTS (tells it NOT to synch them) and then resynched again, then when it finished went back again into TOOLS / OPTIONS and checked the CONTACTS choice for synching and resynched and voila, it worked!