The Optimize Dictionary dialog box optimizes any dictionary you want to use.

You do not need to optimize dictionaries very often. However, it is recommended that you do this from time to time. As you are adding more and more words to your dictionary with the Add to dictionary button (see Spell Check dialog box, section Spelling), the added words should be re-indexed from time to time. This ensures the Spell Checker to work efficiently while word searching.

The options to optimize are: