As far as the invite list goes, people's feelings are gonna get hurt. It sucks, and wouldn't we like to invite everyone we've ever met, but someone that only shares an interoffice relationship with you should understand not being invited. If they mention it, make a point of saying that you would have loved to have them there, but you had to keep the wedding small. Most people can understand that. We're inviting our co-workers, but we both work for small local businesses, so it isn't that bad. My Mom wanted to invite her co-workers as well, but I had to put my foot down. Honestly, if you feel that one person is more entitled to be invited than the rest, they've obviously done something to deserve that.