When a copy of Outlook is purchased and installed, some spell check and autocorrect features will not work. This is expected because Word adds the spelling and autocorrect features and its not available when you install only Outlook.
However… there is a hack that will restore some or all of the missing features: copy winword.exe into the folder where outlook.exe is, then restart Outlook.
Warning: This hack puts you into an unsupported mode and it can have unintended consequences. If you do this and later need to troubleshoot some problem, delete the copy of winword.exe and verify the problem still exists.
Published April 5, 2011. Last updated on February 19, 2014.