Fowarding message results in a composition window without the body of the forwarded message

I'm using TB in my office (imap with an exchange server) since many years ago. Everything worked fine. In the last two months we are experiencing problems with forwarding message. When we hit "forward" in a mail received from subjects sended their message with outlook, the new composite windows misses the body of the forwarded message. I read that 4-5 years ago someone else experienced the same problem, but it was fixed (something with the meta of the forwarded message, base64, something like that). This problem occurs on every PC on ours office's network in the same way: forwarding a message received from a sender who use outlook result in a new window without the body of the forwarded message (there're all the datas about the forwarded message, date, subject, ecc, but no text content). TB: 45.2.0 - Win10 - SBS2011SRV with Exchange Server 2010