A manager should never use "Tú" to refer to an employee unless "it is an informal, personal conversation". The other way around is the same, an employee should always use Ud. while addressing the manager.
I believe it is a sign of disrespect to use "Tú" in such type of communication and if it is addressed to more than one person, it is out of the question, "Uds" all the time.
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[Have a nice day!!!
♥ Sandra T ♥
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