Hello,
Please see the following article:
http://technet.microsoft.com/en-us/library/aa997379(v=EXCHG.80).aspx
“Running SQL Server on the same computer as a production Exchange mailbox server is not recommended. Both SQL Server and Exchange mailbox servers consume a large amount of memory and disk resources to operate optimally. Co-hosting SQL Server and Exchange Server
on the same computer in a production environment will likely lead to poor performance by one or both of the servers. Additionally, troubleshooting and securing such an installation is not well understood.”
“Move either Exchange Server or SQL Server off the computer. Completely removing one of these programs from the computer is recommended”
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com