Desktop

The short answer is I don't think you can. Exhange is designed to use all available memory. What is supposed to happen is when other processes make demands for memory, Exchange will automatically release the required memory as needed and scoop it back up when the other process releases it.

Not sure if this will help, but it might:

There is a problem with vmimb.exe in SBS 4.5 if your FQDN is longer than 32 total characters. Here is a quote from TechNet article Q267256:
"This issue occurs when the POP3 e-mail server that is specified in the properties for either a global or individual POP3 server contains a fully qualified domain name (FQDN) that is longer than 32 characters. Note that this includes the periods between FQDN components."

Check out this article for a possible fix for your problem:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q267256
(please remove any spaces)

Hope this helps.

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