SDK documentation tells that SyncML API's have been removed for S60 3rd edition: "SyncML APIs ... have been removed." (Introduction to S60 3rd Edition >> S60 Platform 2nd Edition And 3rd Edition: Differences In Features)
However, SDK documentation says that SyncML API is supported: "The S60 platform has a SyncML client agent and a synchronization engine. SyncML APIs providing access to synchronization services are available to developers." (Developer Guides >> S60 Platform Basics)
From SDK I can verify that headers and libraries really aren't there anymore. Does anybody know something more about SyncML API's in S60 3rd edition?