This excerpt taken from the PBI 10-K filed Mar 13, 2006.
Failure to Properly Exercise. If a Participant who has. made a valid election under this Article V to defer the gain related to Gain Shares and if the Option expires without a proper exercise of the Option by the Participant or if the Participant fails to properly tender the Consideration Shares by the last day of the Option term, the Participant shall forfeit any opportunity to exercise the Option and the Option shall be cancelled as of the end of the last business day of the Option term.
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