Compose: Check Spelling The Review Ribbon in a Microsoft Outlook Message has all of the robust tools found in Word including Spelling & Grammar, Research and Thesaurus. However, the Spell Checker may not be turned on. You can use the Outlook Options to configure the Spelling and Autocorrect settings.   5. Try it: Enable the Spell Checking The Outlook Options are open. The Mail Category is selected. Go to Compose Messages. Select: Always check spelling before sending   What Do You See? By default, Outlook does not check the spelling in the original message when you reply or forward it.   Keep going... File ->Options ->Mail ->Compose Messages-> Spelling