Setting spelling preferences
You can set your spelling preferences to initiate a spelling check automatically each time you create or edit an activity, history item, note, or opportunity. You can enable the auto-suggestion feature, select and modify dictionaries, and choose types of words to ignore.
To set spelling preferences
From the Tools menu, click Preferences, and then click the Communication tab.
Click the Spelling Preferences button.
Select options as needed. For field definitions, press F1.
Click OK.