Not necessarily. There are plenty of ways for team members to work together without being together. Also, most teams have some work that is collaborative in nature, but at least as much that's individual work. The key to using telecommuting in a team environment is to organize the work so that most of the individual work is reserved for telecommuting days, while the collaboration takes place when everyone is in the office. This might mean, for example, that the team decides to have everyone in the office on Tuesdays and Fridays to assure enough time together.

Even when some team members are telecommuting, it's still possible to collaborate at a distance - individual phone calls, conference calls, email, groupware, and fax are five of the tools that can be used.

Last, keep in mind that teamwork is good up to a point - when everything must be done as a team, there's a risk that tasks will take extra time, and what should be one person's responsibility becomes an interruption for all the other team members. When some of the team members telecommute, it can help the team focus its activities and decide which really are suited to discussion and teamwork - and which should really be done by individuals.