According to a 2001 Gartner report, 64% of at-work Internet users in the United States check their e-mail regularly during the day. Users manage their e- mail an average of 49 minutes each workday.

Intra-organization messaging accounts for much of the traffic. For example, Bob Justus, vice president at San Francisco-based Union Bank of California, says that his bank's 9,800 employees transmit about 82,000 e-mails daily, and 65,000 of those are internal.

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