Do you have a myAppt.Save statement somewhere else to persist your changes to the item?

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> When I run my code below it always shows up that the "ActivityID
> Doesn't Exist" even after I run this multiple times. Does anyone see a
[quoted text clipped - 16 lines]
> MsgBox("ActivityID Doesn't Exist")
> End If