Appliance Vs Software based routers

Dear all Greetings I'm wondering why the software based router is not preferable in business even if they have high featured Processers, and high capcity of memory. What is the main deferent between Appliance router and Software based routers? thank you all in adavance. -- Tarig Y. Adam _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. https://signup.live.com/signup.aspx?id=60969