Answer / tariq

Add /3GB switch to boot.ini file and you can use upto 3GB
memory instead of 1GB by default.

Answer / farooq

just add /3GB switch to the last line in the Boot.ini file and it will do it

Answer / sri

/3GB is applied to machines which have over 1GB of Physical
memory .Its is not recommended for Exchange servers running
DC .Like SBS , adding /3GB switch to servers running DC &
exchange might cause the server not to reboot .

Apart from this we can add /userva switch along with /3GB.

/userva switch will optimize memory & performance on the
exchange server

http://support.microsoft.com/kb/316739

Answer / ragav

the above answer is correct , but microsoft wont recommend
to add the above switch in boot.ini

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