Hosted Exchange Server help needed

We are using hosted Exchange from verio.com. We need someone with adequate MS Exchange configuration (preferably a MCTS). Our initial requirements are as follows: 1) Exchange is sending multiple outgoing emails (specifically read receipts), and is downloading multiple copies of the same emails so many duplicates are showing up, constantly.. 2) We need all email users that can view Public Folders to be able to respond to emails within those public folders from the specific emails the customer sent the email to (and not from their unique email that they are logged in through) and all other users viewing the public folders need to see when any emails have been responded to so they don't respond as well. We have some other requirements as well once these major components are done. Please quote accordingly a price and ETA. Thanks