How to get universal outlook mailitem ConversationID for one email chain replied from different users
I am developing an OUTLOOK 2010 addin in C#. This addin will create activities based on conversation. For example, one user create new email, others reply,forward or CC, treat this email chain as one converstaion thread. Thoes emails have the same mailItem.ConversationID. Based on this conversationID, my program generated an activty, and link conversationid to the activity which can be seen in each email in this email chain. It all works fine on my machine (I reply,forward,cc in the same email chain, it get the same conversationID). However when other user reply email trigger my program