A family of Microsoft word processing software products for creating web, email, and print documents.
Well, the AutoText feature has been redesigned and expanded into a more complex feature, called Building Blocks, and AutoComple suggestions have been removed (in Word 2007) and then reintroduced (in Word 2010), which explains why issues may occur.
Note that AutoComplete only works if it can uniquely identify the entry whose name you are starting to type. Naturally, with a lot more entries to choose from, this is a more difficult task in Word 2010 than it used to be in Word 97-2003. Also, remember the limitations: entries must be in Normal.dotm or in the template attached to the current document for AutoComplete to work.
Also, as Charles stated, you are not communicating directly with Microsoft in these forums, unless a person has the "Microsoft employee" title (in the Help section, see "Who's who in the forums?").