I am working on an application based on ActiveSync protocols. Upto version 12.1 everything is working fine. For 14.0, foldersync, getitemestimate, sync operation are working. I am able to sync the PIM data from the server. But the problem is in SendMail operation. I am getting the response for Sendmail as status code 110 which means the unknown error on the server. I checked the data which I am sending to the server, and it is as per the protocol mentioned in the document. So I am stuck at this point. If there is unknown error on the server, how to proceed? If any body faced the same problem, and have a solution for this, please let me know.