There are programs that claim to recover deleted messages but I have not seen one that has worked before. Once, the emails are missing or deleted, they cannot be recovered. In regards ***** ***** statement about the message being on the company server, it is possible that they are on the server but it would require a subpoena to have them released to you.
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Sorry for any confusion -- When I said "Deleted", the same goes for "missing" text messages as well. There isn't a location to look on the phone other than in the messages section.