A family of Microsoft word processing software products for creating web, email, and print documents.
AutoText does work in Word 2010 although it is slightly different from Word 2003 (or Word 2002).
If you want the tooltip to show, the AutoText must be stored in normal.dotm. The tooltip is needed for you to be able to press Enter to insert the AT.
Otherwise, you need to press the F3 key to insert your entry. So long as you have typed at least three characters and it is enough to uniquely identify your AT Entry.
I'm used to the tooltip as well and have not generally stored anything I want to keep in normal. It is one of the pains of the changes to Word. I'll live with it.