"Groups" is missing from the general search and user Account Settings. This seems really odd...why did the development team leave it out? It's actually rather annoying having to select select individual Groups just to see if a person is in it or not! We shouldn't have to resort to code or a report to get this information.
While I'm not an advocate of "hey, vote up my Idea" I think this is a glaring over-sight within the Server product. I encourage you to vote it up and provide additional feedback in the Idea if necessary.