The Rides and Tours

Citing the privacy of its customers, Google’s public relations department would not comment on inquiries about Gmail enrollment figures. But the service has already taken a secure hold at Harvard.

After news of the search-engine’s newest venture spread last summer, dozens of students have switched to Gmail as their primary e-mail client, citing its extensive search features, speed and unique “conversation” feature that organizes e-mail messages according to their authors and replies.