Sharepoint and Full Text Indexing and Searching
With SBS2003 Standard, Sharepoint uses WMSDE. But if you have SBS2003 Premium, and have installed SQL you should consider upgrading your Sharepoint site to SQL. Besides better performance as you add more users, you also gain the ability to enable full text indexing and searching!
Instructions for upgrading Sharepoint to SQL and enabling fulltext search can be found in KB article 837367: http://support.microsoft.com/?kbid=837367