Siemens Business Services (SBS), recently conducted a survey of 300 white collar workers, and found that IM is quickly eclipsing the use of e-mail and the telephone at work. The reason? IM increases productivity, according to 78% of respondents. The Siemens survey reveals that 76 percent of employees send fewer emails and 84 percent make fewer phone calls because they accomplish their communications through IM. I have been saying that IM is the real killer app.