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I would suggest reviewing our help article that shows a sample implementation of ExchangeProvider that will communicate with the Exchange server and synchronize your RadScheduler control.
I would summarize the required information in the code snippet below in order to work as expected.
sender, EventArgs e)
"your calendar name"
"your user name"
sender, SchedulerEventArgs e)
Please find attached a sample example that follows the aforementioned help article implementation.
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