Just went to Office Starter to check there for updates.
First thing I noticed in my Programs menu is that it says Office Starter (English). The pop-up says Office Starter - English. A dash not brackets.
There were apparently a couple of 14 October updates to Office 2010 but further investigation reveals that if you enable automatic updating, most of these updates are automatically installed with no input required by the user.
I came to a Microsoft Safety & Security page that describes the update process (copy/paste in new tab)
http://www.microsoft.com/security/pc-security/updates.aspx
<<Pay attention to Windows Update warnings
When you turn on automatic updating, most updates will download and install on their own. Sometimes Windows Update will need your input during an installation. In this case, you'll see an alert in the notification area at the far right of the taskbar—be sure to click it. >>
Notice that Microsoft refers to the pop-up window in the taskbar, far right. That is the usual place I see notifications.
The fake pop-up update is always in the middle of the screen. This is not where Microsoft puts notifications.
Whenever I check for new updates my PC is up-to-date. Therefore, this pop-up is bogus. And, as we have all learned this dubious pop-up has been around since at least August 2010, the earliest report I could find.
I would like to know who is behind this hoax. In the meantime, I am going to disable automatic Office updates to see if the pop-up disappears--I'm betting that I will continue to receive the fake update since users who don't even have Office Starter installed
are plagued by them as well.