Exchange Server 2007 creates 1MB of transaction log files instead of 5MB as was the case in previous versions of Exchange. Lost Log Resilience (LLR) is the reason behind this change. In previous Exchange versions, if a crash destroyed the last few log files which were not committed to the database, we had to restore or repair the database to mount it. But LLR hold the last log files in its memory until the database is shutdown. The benefit is that Exchange simply skips those log files which are not written to the databases and simply mount the store.
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