How to troubleshoot issues that Spell Check is not working in Outlook 2013

Question

When composing a new message in Outlook 2013, we may notice that Spell Checker does not recognize misspelled words. When we enter a completely garbage word in Outlook, it won’t be marked as misspelled with a red wave underline. When encountering such issue,
we may follow the troubleshooting guide below to correct it.
1. Make sure you are not typing in the signature area.
Outlook doesn't perform a spell check in the signature area, so if this is the case, spell check won’t work. To confirm if you are typing in the signature area, right click in the area you are typing, if you see a menu listed all you signatures instead of
the normal context menu, then you are not typing in the email body.
If you want spell check work in signature area, use Quick Parts instead of Signature. For more information, see
Quick Parts.
2. Check the Set Proofing Language option.
In Outlook, click New Email to open a new message, click
REVIEW tab > Language > Set Proofing Language, a dialog titled
Language will open.
Please first make sure English (United States) is shown above the double line. If not,
you must enable the language for it to be available to check spelling.
Second, make sure “Do not check spelling or grammar” check box is not selected.
Note: If this method fixes the problem, repeat steps 1 through 3 to reopen to the
Language dialog box, and then click Set As Default.
3. Enable Check spelling as you type.
To enable the option in Outlook, go to File > Options > Mail, click Spelling and Autocorrect button. In the Editor Options dialog, select the check box labelled “Check spelling as you type”.
4. Make sure that you are not using a standalone version of Outlook or mixed versions of Word and Outlook.
The “Check spelling as you type” feature doesn’t work when using a standalone installation of Outlook or mixed versions of Word and Outlook. However, the manual spell check always works. In this scenario, we can set Outlook to
always check spelling before sending. To do this, go to File > Options > Mail, select the check box before “Always check spelling before sending” in the Compose message section.
5. A registry key exists overriding the spell checker
To remove the registry key, please follow these:
Important This article contains information about how to modify the registry. Make sure that you
back up the registry before you modify it.
a. Press Windows key + R to open the Run command.
b. In the Run box, type regedit, and then press Enter.
c. Locate the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Shared Tools\Proofing Tools\1.0\Override
d. Delete or rename the subkey.
e. Exit Registry Editor. Restart Outlook.
6. Recreate the NormalEmail.dotm and Normal.dotm template
If the two templates above are corrupt, this issue may also happen. To fix it, please browse to:
drive:\Users\username\AppData\Roaming\Microsoft\Templates
Rename the two templates, then restart Outlook to see the result.
7. Problematic add-in
Add-ins may cause various issues in Outlook, so if you have tried all the suggestions and still no luck, try starting Outlook in safe mode to see if a problematic add-in is the culprit. To do this, exit Outlook, press Windows key + R to open the Run
command, then type outlook /safe and press Enter. If the problem disappeared in safe mode, then go to File > Options > Add-ins and disable the suspicious add-in to resolve the problem.
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Answer 1

Not all locales come with a dictionary installed for licensing reasons.<br />
If you do not have the en-US locale then check that you have a dictionary installed (Tools > Add-ons > Extensions) and selected.<br />
<br />
You can see which dictionary is selected if you right-click in a text area and open the Languages submenu.<br />
Also make sure that [X]"Check Spelling" in the right-click context menu has a tick.<br />
You can also try to toggle the "Check Spelling" item off and on again.<br />
<br />
See http://kb.mozillazine.org/Spell_checking and [[Using the spell checker]]<br />
See also http://kb.mozillazine.org/Dictionaries<br />