Word 2007 Opening a document (search criteria)

I have just upgraded (why?)

I used to use Word 2000.

Now, if I had 1000 documents in a folder say for instance invoices and I wanted to open one of them which included a certain word I would open up the folder and do a search for content includes “abcltd” then Word would search for all files with that text in it and I could open up the one I wanted.

How do I do this in Word 2007?