We've started using Zimbra with BES10 and Blackberry Z10's, for the most part everything works well. One issue we have is when a message is deleted on the phone it is deleted on the server also, but is not available in the Trash folder. I found a Blackberry KB that confirms this as an issue with Exchange 2003 and Activesync 2.5. We're using Zimbra 7.2.2 and would like to confirm if this version uses Activesync 2.5 and also if upgrading Zimbra to a different version would resolve this issue.

KB33560-Email messages deleted from the BlackBerry 10 smartphone are not moved to a Trash or Deleted Items folder and instead are permanently removed