Question : What is the best way to create an external distribution group in Exchange 2010

What is the best way to create an external distribution group in Exchange 2010....and is there any way to quickly import the address from a cvs or .xls file?

Answer : What is the best way to create an external distribution group in Exchange 2010

if you have Excel Services, it's MOSS.

to tell for sure, you can look at Central Administration.  look for an SSP, or an ability to configure an SSP.  you won't have that in WSS.

or, look at the version number.
http://insomniacgeek.com/blog/how-to-determine-the-installed-sharepoint-version/