We report an empirical study of a synchronous messaging application with group-oriented functionality designed to support teams in the workplace. In particular, the tool supports group chat windows that allow members of a group to communicate with text that persists for about a day. We describe the experience of 6 globally-distributed work groups who used the tool over a period of 17 months. An analysis of use shows that the group functionality was used primarily for bursts of synchronous conversations and occasional asynchronous exchanges. The content was primarily focused on work tasks, and negotiating availability, with a smattering of non-work topics and humor. Nearly all groups were remarkably similar in the content of their group chat, although the research group chatted far more frequently than the others. We conclude with suggestions for future research, and a discussion of the place of team-oriented synchronous messaging tools in the workplace.