Why is the SEP 11.1.1101 doesn't need to enable computer browser service to browse the network?

Dear All,

  I found that I need to enable the computer browser service to browser the network client for SEP 12.1.2015.2015. However, I do not need to enable this service in SEP 12.1.1101 for the network browsing. Both server version is windows 2008 r2 standard. Do anyone know the difference??

Many thanks

Best Regards,

Elroy