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Hmmm, well Office’s translation tool is really just using Bing’s online translation feature and doing it through Office instead of requiring you to open a browser window. I assume that it at least uses an SSL connection, but that's not going to encrypt the data. Have you actually confirmed that the translator is sending it plain text? I’m not really sure how you could do anything beyond encrypting the files within Office, which would not necessarily have an impact on the files when they are being transmitted to be translated. Perhaps you could use 3rd party translation software on your PC?