How to access unread mails of all users in Exchange server without having Passwords and without giving mailbox access to other user.

Question

Hi all,
   I am using Exchange server 2013, my task is to create
Service , that
need's to  monitor continuously for new mails of all Mailboxes in
my server. if any user got new mail i need to get that Mail Subject, Mail Body, Sender Email Address [From emailId] .  
Limitation
: I don't have Passwords of mailboxes , so i gave all mailbox access permission  to one user , then i completed this   service using below code.
 But now, Client
not willing to give Mailbox Permissions to one user because of security problems.
How can i do this without passwords and without giving permissions to other user ?
i don't want all mailbox access , i just need only
access Mail Subject , Body and Sender mail address .
How can i achieve
this ?
Process i follow
=> I created new user in server , and then i gave full permissions of all Mailboxes to newly created user[ex: james] in database level.
     i use below command for giving permissions in database level.
Get-MailboxDatabase -Identity <Database Name> | Add-ADPermission -User <User> -AccessRights GenericAll
 => using below code i am searching unread mails of all user Mailboxes and then getting Subject, body and Sender Email            address . here i am have list of users,
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013);
service.Credentials = new WebCredentials("[email protected]", "password");
service.AutodiscoverUrl("[email protected]");  foreach (Object obj in usersList) // here i have Mailbox users list in usersList
             { var userMailbox = new Mailbox(obj.user);
var folderId = new FolderId(WellKnownFolderName.Inbox, userMailbox);
SearchFilter.IsEqualTo filter1 = new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false);
var itemView = new ItemView(50);
var userItems = service.FindItems(folderId, filter1, itemView);
foreach (var item in userItems)
item.Load();
var senderEmail = ((EmailMessage)item).From;
var subject = item.Subject;
var body = item.Body;

Answer 1

You would need to check that possibilities via WebServices but suggest you to post this in Development forum to get help from programmers....
http://social.technet.microsoft.com/Forums/office/en-US/home?forum=exchangesvrdevelopment
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