This one works good.. I like it. Hope it Helps.
Thanks T M Z
MoblMsg 1.0 allows you to Create Group Text Message Lists on your WM phone, Send Text Messages to Groups and Individuals, and Review Sent Messages.
This application lets the user:
* Create Group Message Lists on your phone.
* Send Messages to Groups and/or Individuals in their phone’s “Contacts” list.
* Store and Review a list of Sent Messages to these groups.
P.S. and it's free.