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Arial gang assemble!
I handle a lot of docs and pdfs from the government, a lot are already Calibri so it's nothing new. >

Calibri is arguably the best choice. TNR was used in newsprint because the strong serifs helped preserve readability at fast press speeds. The typestyle has outlived its purpose. Whereas Calibri is designed to be efficient and readable at small sizes, and is very common already.
Senior Designer working for a Very Large Firm.