I work in a moderately sized company of roughly 50-60 people. I have been presented with a birthday card to sign for a person. I'd normally sign it, but it is just that every other message is rather personal and sincere.
I've never met this person, or even seen them. In fact, it seems no one from the management group knows this person. I am included in this management group. Would it be unprofessional for me to not sign the card?