This may sounds straight forward and trivial, but think again. I tried changing my dictionary settings in my Microsoft Office for Word, Power Point and Excel. Because this is not something you will do everyday, it took me 2 hours figure it out! That's why I've decided to blog about it for future reference and for all of your who needs it.

For Word, Power Point or Excel:

1. Highlight the text affected
2. Select "Tools" from the menu bar.
3. Under "Tools", select "Language"
4. Mark selected text as: select "English (United Kingdom)"
5. Select "Default"
6. Accept the warning that it will affect this presentation and all future presentations. (which it obviously does not.
7. Click on "OK"
8. Exit and save document and reopen