XL: Suggestions Are Not Made from Custom Dictionary

CAUSE

If Microsoft Word is installed on your computer, Microsoft Excel uses the Microsoft Word spelling tools. When Microsoft Excel uses the Word spelling tool, this problem occurs because, by default, Microsoft Word suggests words from the main dictionary only.

Note that in Microsoft Word, there is a Suggest From The Main Dictionary Only option that you can clear if you want suggestions to come from the custom dictionary. However, this setting does not apply to Microsoft Excel because it is written to the WINWORD.INI file and Microsoft Excel does not have access to this file.