I have an Access database that keeps track of my team's cross-training sessions. I added some coding to create an Outlook meeting invite (I'm using Access and Outlook 2010). I decided to include the supervising manager as an optional attendee (so the manager is aware of the training session but isn't under an obligation to attend). This is the section of code in question:

Dim oOLApp As Object
Dim oOLInvite As Object

Set oOLApp = CreateObject("Outlook.Application")
Set oOLInvite = oOLApp.CreateItem(1)

oOLInvite.Subject = Me.txtSubject & " (cross-training session)"
oOLInvite.MeetingStatus = 1
oOLInvite.Start = Me.txtSessionStart
oOLInvite.End = Me.txtSessionEnd
oOLInvite.RequiredAttendees = strToFull
oOLInvite.OptionalAttendees = strManager
oOLInvite.Body = Me.txtCurriculum
oOLInvite.ReminderMinutesBeforeStart = 15
oOLInvite.ReminderSet = True
oOLInvite.Display

Set oOLInvite = Nothing
Set oOLApp = Nothing

The problem comes when Outlook resolves the addresses. If I click on the 'To' button as soon as the invite displays, and the addresses are resolved while the dialog box is open, everything seems fine. However, if I don't click the button, and the addresses are resolved while the main invite window is open, the manager is suddenly converted from an optional attendee to a required attendee.

What's causing this? Is there a way to prevent it from happening?

Thanks,
Kristen