VBA Outlook Email, update current/selected field before sending - vba

Question

I wrote a macro, where the starting time of a meeting should be entered into the "Subject" Field of a meeting and the mail will be automatically send right after.
When I start the macro through a button and the last selected field like Subject or Start Time is selected and changed, the email will be send, but with the old data.
For example:
My last input to the email was the text "Test" in the empty Subject field. After that I send the email, through the button.
The email is sent, but the subject field remains empty.
Is there a way to update fields like subject and starttime?
I tried to use commands like update, SendKeys "{TAB}", myItem.Close olDiscard to close and update the field and send it right after.
Sub startTimeSend()
On Error GoTo HandleErr
Dim myItem As Object
Set myItem = Application.ActiveInspector.CurrentItem
Dim oldTitle As String
Dim startTime As String
Dim scanForOldNr As String
Dim newStartTimeFormat As String
' olPromptForSave
' SendKeys "{ENTER}"
' SendKeys "{ENTER}", True
' Application.SendKeys ("{ENTER}")
oldTitle = myItem.Subject
startTime = myItem.Start
' MsgBox (oldTitle)
' scanForOldNr contains third char (usually ":")
scanForOldNr = Mid(oldTitle, 3, 1)
If scanForOldNr Like "*:*" Then
' 7 da es von 1 hochzählt nicht null
' MsgBox (scanForOldNr)
oldTitle = Mid(oldTitle, 7)
End If
' Cancel = True
newStartTimeFormat = Format(startTime, "hh:mm")
myItem.Subject = newStartTimeFormat & " " & oldTitle
myItem.Send
ExitHere:
Exit Sub
HandleErr:
' Cancel = False
Resume ExitHere
End Sub

Answer 1

Outlook doesn't propagate changes made via OOM to the UI until you close and re-open the item. Or your changes made manually may not be visible in the OOM until the item is saved. I'd suggest dealing with proper OOM properties instead of inventing new mechanisms for sending and receiving data.
Use the AppointmentItem.Start property which returns or sets a Date indicating the starting date and time for the Outlook item. To get the associated appointment you can use the MeetingItem.GetAssociatedAppointment method.