sabotoge by former board members

I am a member of a board that has an email service owned by a former board member,we notice that our email correspondence is being leaked to homeowners. W e are in the process of switching to another service in the meantime. I am the president can i call a special meeting to shut this service down and start anew one? I have to keep asking for financial and email addresses of homeowners from 2 board members who were on the previous board. How do i handle this?