Exchange 2007: Transport Logs

I needed to check our Exchange Transport logs, specifically MessageTracking to see if a user sent an email back in August. However, I cannot find any logs older than November 7th.

How do I increase the amount of days the logs are kept?
InfoTechEEAsked:
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setasoujiroCommented:
If you are making backups of your exchange with "exchange aware" backup software then the logs are commited and flushed after the backup is completed... That could be the reason the logs are gone?
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InfoTechEEAuthor Commented:
We are not backing up the logs. We use Backup Exec 2010 with Granular Exchange Backup, but only backup the Information Store.
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InfoTechEEAuthor Commented:
And system state as well.
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setasoujiroCommented:
when you backup exchange information store the logs get flushed...
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InfoTechEEAuthor Commented:
That option is not selected. So logs are actually kept for 30 days. We backup exchange weekly. I need to keep logs for at least 120 days. There is plenty of storage available.
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