Explain it to me....

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Would somebody please explain to me why certain people in the world -- let's call them coworkers -- feel compelled to call you up and leave a message on your voicemail saying "I just wanted to let you know that I just sent you an e-mail." What is the purpose of this? When did this suddenly become a fashion, to send somebody an e-mail and then follow it up with a phonecall / voicemail? Doesn't that defeat the purpose?

Somebody... please enlighten me.