Here at NHS they are using Desktop, however there are restrictions on scheduling.
Scheduling is all controlled outside of individual user control to prevent conflicts and to prevent multiple users trying to schedule the same thing at different times (ie big disco report output is cached onto the reports/disco server to provide multiple access).
However, since we have a potential 100,000 users everything is done differently here <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
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my random musings courtesy of Twitter