which calendar did a user access for forward a meeting on

a user has accessed one of potentially 5 peoples calendars (it was a team meeting with several attendee's), and forwarded a meeting request on to a 3rd party. I can see from the tracking logs that they did it (as it shows that email sent to the 3rd party, from this  person in question), but I need to identify which persons calendar they accessed to forward the meeting on to this 3rd party (for the record they do have access to all of these users calendar). Is this possible through any of the exchange logs or outlook logs?
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pma111Asked:
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pma111Author Commented:
custom-data field looks quite promising in the exchange tracking logs. it contains a purportedsender type record.
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Jian An LimSolutions ArchitectCommented:
depends on what kind of logging you have
mailbox auditing should log any



mailbox auditing also will have logs shows a non-owner access to the mailbox
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