In the company we're addressing each other in an informal way over email and in person, which I appreciate.
But then we also have people from all over the world, we have Chinese and Japanese, we have French and at least one Swede, so it can be difficult for people to know which name is supposed to be your given name. On top of that, the mail system has your display name in one order but the address in the other order.
So I get a lot of emails starting with "Hello Wallin", and it's not their fault but it's a little bit jarring each time. =)