EXPERT RESPONSE
MDBDATA log files are transaction log files which are an integral part of your Exchange database. For example, if your database ever fails and you have to recover from backup, the MDBDATA transaction log files can (under normal conditions) be replayed to bring your Exchange database to its most-recent state. As such, MDBDATA log files should never be deleted.
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Related information from SearchExchange.com:
Tip: How to manually (and safely) purge Exchange Server transaction logs
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Reference Center: Exchange transaction log tips and resources
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