EWS .NET API: Invalid named property error when setting an extended property to EmailMessage object RRS feed

  • Question

  • Hi,

    I am using EWS .NET API.

    When I try to set extended property using either default property set or my custom GUID as property set Id in the .NET code, I receive error 'An internal server error occurred. The operation failed., Invalid named property: [{1ea5aebe-567f-44c7-8b26-936bf90ea5fd}:'PropertyName'] GuidName_PropertyName'.

    The mail box is on Office 365.

    This error is occurring to a specific mail box. The code works well for other mail boxes.

    With regards,


    Wednesday, January 11, 2017 6:29 AM


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