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Asked: 2026-05-28T00:34:59+00:00

I’m trying to use the Exchange 2007 API to query calendar availability for a

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I’m trying to use the Exchange 2007 API to query calendar availability for a specific user. My sample code is producing the following exception:

The time duration specified for FreeBusyViewOptions.TimeWindow is
invalid.

Here’s the sample code:

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

service.AutodiscoverUrl("email@domain.com");

DateTime startTime = new DateTime(2012, 1, 6, 7, 0, 0);

TimeWindow tw = new TimeWindow(startTime, startTime.AddHours(8));

GetUserAvailabilityResults result = service.GetUserAvailability(new List<AttendeeInfo> { new AttendeeInfo("email@domain.com") }, tw, AvailabilityData.FreeBusyAndSuggestions);

The wierd thing is, if I replace my startTime assignment with the following it works:

DateTime startTime = DateTime.Now;

What’s the difference between the DateTime object I created and the object produced by DateTime.Now. I’ve examined them in detail while debugging and can’t find a difference.

Any ideas?

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1 Answer

  1. Editorial Team

    This actually appears to be an issue in the GetUserAvailability method as opposed to any DateTime manipulation.

    According to the MSDN documentation:

    The GetUserAvailability(Generic ,TimeWindow,AvailabilityData,AvailabilityOptions) method supports only time periods that are a minimum of 24 hours long and that begin and end at 12:00a.m. To restrict the results of the method to a shorter time period, you must filter the results on the client.

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