You can't send a document to another user who hasn't got the data source.
When MS Word uses a database or a data source it only reads the lines that it requires without copying the data into the file itself.
This means that when you sednd the file you are saving a link to the data source, and not the data from the data source.
Sorry if this doesn't help you very much.
Is there any reason why the useres can't have access to the data source as-well?