C# (CSharp) Microsoft.Exchange.Data.Directory.Recipient ADRecipientRestriction.IsNullOrEmptyCollection - 2 examples found. These are the top rated real world C# (CSharp) examples of Microsoft.Exchange.Data.Directory.Recipient.ADRecipientRestriction.IsNullOrEmptyCollection extracted from open source projects. You can rate examples to help us improve the quality of examples.