Outlook联系人同步 - 如何识别要同步的正确对象？

I have a web application that syncs Outlook contacts to a database (and back) via CDO. The DB contains every contact only once (at least theoretically, of course doublets happen), providing a single point of change for a contact, regardless of how many users have that particular contact in Outlook (like Interaction or similar products).I have a web application that syncs Outlook con