The total number of threads configured for the message store (41) appears to be too small for the current store configuration. Using 0x2a threads instead.
As per Microsoft: "Rerun the Exchange Server Performance Optimizer with the default options. Be careful not to move the location of database and/or log files if the recommended location is not what it desired.". See the link below (applicable to Exchange 5.0 but it may work for 5.5).
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