Client reports integrate with the Mail Merge module. Output from client reports provide the "Merge" output destination which permits you to select a merge template into which to merge the selected client data.

Above is a sample merge of 10 client records into the Mail Merge module's Merge Viewer. From this dialog you can make edits to the output, save the output off to a file for later use, exclude certain records, change font, print the merge output etc.