I want to improve the speed of iterating through Items using the SetColumns method, but I run into problems when I try to include a custom property in the column list. I've used this same custom property in restrict filters, and have double checked that it is a property of the folder as well as the items. The custom property is a string type. The offending line of code is: Items.SetColumns("MyCustomProperty, FullName, BusinessAddressState") With the error: "The Property "MyCustomProperty" is unknown." It works fine without the custom property in there. Thanks for any help!