On 10/05/2013, some of the users & respective group policies were deleted in AD, W2k3 server. This was connected with Exchange server 2003. After this issue, we recovered some of the users, using adrestore. After this, there is absolutely no synching between AD & Exchange server 2003 for the users. (Eg: if we reset the password in AD, we have to again reset the password in exchange also). Please guide us to troubleshoot the issue.