Category.CategoryID Property

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Outlook Developer Reference

Returns a String value that represents the unique identifier for the Category object. Read-only.

Version Information
 Version Added:  Outlook 2007

Syntax

expression.CategoryID

expression   A variable that represents a Category object.

Remarks

Because the Name property of a Category object can be changed either programmatically or by user action, each Category object is uniquely identified by a globally unique identifier (GUID), assigned to the object, that can be retrieved using this property. The GUID is presented as a string using the following format:

  {00000000-0000-0000-0000-000000000000}

Example

The following Visual Basic for Applications (VBA) example displays a dialog box containing the names and identifiers for each Category object contained in the Categories collection associated with the default NameSpace object.

Visual Basic for Applications 
  Private Sub ListCategoryIDs()
    Dim objNameSpace As NameSpace
    Dim objCategory As Category
    Dim strOutput As String
    
    ' Obtain a NameSpace object reference.
    Set objNameSpace = Application.GetNamespace("MAPI")
    
    ' Check if the Categories collection for the Namespace
    ' contains one or more Category objects.
    If objNameSpace.Categories.Count > 0 Then
        
        ' Enumerate the Categories collection.
        For Each objCategory In objNameSpace.Categories
        
            ' Add the name and ID of the Category object to
            ' the output string.
            strOutput = strOutput & objCategory.Name & _
                ": " & objCategory.CategoryID & vbCrLf
        Next
    End If
    
    ' Display the output string.
    MsgBox strOutput
    
    ' Clean up.
    Set objCategory = Nothing
    Set objNameSpace = Nothing
    
End Sub

See Also