EdgeTransport.exe consuming more memory in Exchange server 2007

Log details
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Event Type: Warning
Event Source: MSExchangeTransport
Event Category: ResourceManager
Event ID: 15001
Date: 12/2/2008
Time: 1:31:28 AM
User: N/A
Computer:
Description:The resource pressure changed from High to Normal.
Statistics:
Queue database and disk space ("D:\exchsrvr\TransportRoles\data\Queue\mail.que") = 56% [Normal] [Normal=72% MediumHigh=74% High=76%]
Queue database logging disk space ("D:\exchsrvr\TransportRoles\data\Queue\") = 64% [Normal] [Normal=93% MediumHigh=95% High=97%]Version buckets = 27 [Normal] [Normal=40 MediumHigh=60 High=100]Private bytes = 15% [Normal] [Normal=71% MediumHigh=73% High=75%]
Physical memory load = 91% [limit is 94% to start dehydrating messages.]
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Event Type: Information
Event Source: MSExchange TransportService
Event Category: ProcessManager
Event ID: 1020
Date: 08/12/2008
Time: 11:18:55
User: N/A
Computer:
Description:Worker process with process ID 280 has exited.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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Steps worked :
1. Took a backup of EdgeTransport.exe config file and changed the default value of :
PercentageDatabaseDiskSpaceUsedHighThreshold from "0" to "80
and restarted the Microsoft Exchange Transport Service.
2. monitored the memory consumption.
3.Installed the Exchange Rollup update 6[http://support.microsoft.com/kb/942846 ] for exchange server 2007 on the affected servers.
Results : after the installation of rollup update the memory cosumption has reduced drastically