In seldom cases, the Outlook Web Sensor produces the following error when it comes to the Calendar Lookup Simulation

OutlookWeb: lookup for user <username> failed with error System.Exception: Proxy web request failed. , inner exception: System.Web.Services.Protocols.SoapException: Periods have duplicate IDs.


Solution

Adjust the Outlook Web Sensor

  • open the Outlook Web Sensor
  • Select the following item in the Exchange Version field

Exchange 2007 SP1

  • Save
  • Hit Deploy Sensor Configuration