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MailItem.Open event (Outlook)

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Occurs when an instance of the parent object is being opened in an Inspector.

Syntax

expression.Open (Cancel)

expression A variable that represents a MailItem object.

Parameters

Name Required/Optional Data type Description
Cancel Required Boolean (Not used in VBScript). False when the event occurs. If the event procedure sets this argument to True, the open operation is not completed and the inspector is not displayed.

Remarks

When this event occurs, the Inspector object is initialized but not yet displayed. The Open event differs from the Read event in that Read occurs whenever the user selects the item in a view that supports in-cell editing as well as when the item is being opened in an inspector.

In Microsoft Visual Basic Scripting Edition (VBScript), if you set the return value of this function to False, the open operation is not completed and the inspector is not displayed.

Example

This Visual Basic for Applications (VBA) example uses the Open event to display the "All Fields" page every time the item is opened.

Public WithEvents myItem As Outlook.MailItem 
 
 
 
Sub Initialize_handler() 
 
 Set myItem = Application.Session.GetDefaultFolder(olFolderInbox).Items(1) 
 
 myItem.Display 
 
End Sub 
 
 
 
Private Sub myItem_Open(Cancel As Boolean) 
 
 myItem.GetInspector.SetCurrentFormPage "All Fields" 
 
End Sub

This Visual Basic for Applications example uses the Unread property to detect whether the item has been previously read. If it has, then it asks if the user wants to open it. If the user answers No, the return value is set to False to prevent the item from opening.

Public WithEvents myItem As Outlook.MailItem 
 
 
 
Sub Initialize_handler() 
 
 Set myItem = Application.Session.GetDefaultFolder(olFolderInbox).Items(1) 
 
 myItem.Display 
 
End Sub 
 
 
 
Private Sub myItem_Open(Cancel As Boolean) 
 
 Dim mymsg As String 
 
 If myItem.UnRead = False Then 
 
 mymsg = "You have already read this message. Do you want to open this message again?" 
 
 If MsgBox(mymsg, 4) = 6 Then 
 
 Cancel = False 
 
 Else 
 
 Cancel = True 
 
 End If 
 
 End If 
 
End Sub

See also

MailItem Object

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