You mean to say In Senders calendar still have the old entry but not the updated one?
Is it happening with all the users or just one user?
How long its been happening? Is it migrated scenario?
Gulab | MCTS-MCITP Messaging: 2010 | MCTS-MCITP Messaging: 2007 | MCC 2011 | Skype: Gulab.Mallah