A family of Microsoft word processing software products for creating web, email, and print documents.
What you describe suggests that someone has run the Document Inspector on the document and chosen to remove personal information.
Here's how to fix the problem: Make sure that the affected document is the active document in Word. Click File | Options | Trust Center | Trust Center Settings | Privacy Options and clear the check mark next to "Remove personal information from file properties on save." Click OK. Save the document. In the future, user names will be preserved.