How to Create an Initial Full-Text Index
To enable users to perform full-text searches of mailbox and public folder stores, you must create an initial full-text index. To create an initial full-text index, follow this procedure.
Procedure
To create an initial full-text index
In Exchange System Manager, right-click the mailbox store or the public folder store that you want to index, and then click Create Full-Text Index.
When a dialog box prompts you to select the location for the index, specify a place for the index on the RAID array.