Hi Sharif. Have you changed your database from .mdb to .accdb? If so, then your parameter queries will no longer work with mailmerge! Gina Whipp (from this forum) recommended Albert Kallal's excellent solution (http://www.kallal.ca/wordmerge/index.html)
Alternatively, trying exporting your query to an .rtf file and merging from that.
Or create a report from the query (if you don't need to change the final document).