UserProperty Object [Outlook 2007 Developer Reference]

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UserProperty Object
Represents a custom property of an Outlook item.

Remarks

Use UserProperties(

index), where index is a name or index number, to return a single UserProperty object.

Use the Add method to create a new UserProperty for an item and add it to the UserProperties object. The Add method allows you to specify a name and type for the new property.

Bb219977.vs_note(en-us,office.12).gif  Note
When you create a custom property, a field is added in the folder that contains the item (using the same name as the property). That field can be used as a column in folder views.

Example

The following example adds a custom text property named MyPropName.

Visual Basic for Applications
Set myProp = myItem.UserProperties.Add("MyPropName", olText)