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As a result of the extensibility of the XML base , OPML has been used to organize many kinds of data as it may be customized for each application . This expert thinks not . Article : Linux , Webmail are killer apps Adoption of Web-based messaging , or Webmail , is increasing , says this expert . For MTN , the Oracle9i Real Application Clusters ' built-in server redundancy offers clear advantages , the most compelling of which is that average fail-over time is 10 to 15 seconds compared to four to six minutes for traditional processor fail-over .