Smart tags for financial symbols

[otisx]

Why do smart tags only recognize 3 characters for financial symbols? I have
tried two characters, four characters and five characters, all valid stock or
mutual fund symbols. None of them are marked with smart tags, only the 3
character symbols.

 

[otisx]

I found the answer in another part of the forum. In order to fully use
financial symbols with smart tags, you need an add-in. Why doesn't Microsoft
mention this in their discussion of smart tags? Just a rhetorical question.