In earlier versions, inserting the number of pages is a quick click on the Header and Footer toolbar. That toolbar's gone in Word 2007 and 2010, but the option is still available, if you know where to look.
Inserting the page number in earlier versions of Word is simple. You open the header or footer and click the appropriate options on the Header and Footer toolbar. The Page Numbers option is also available from the Insert menu. It's still easy in Word 2007 and 2010, but finding the options might complicate the task just a bit.
To insert a page number at any time in a Word 2007 or 2010 document, click the Insert tab and then click Page Number in the Header & Footer group. Although this option is in the Header & Footer group, you can select Current Position to insert a literal page number almost anywhere in a document; you're not limited to the header and footer sections. That's the easy part.
You can also click the Insert tab and click Header or Footer from the Header & Footer group. The resulting gallery will offer a number of pre-defined page numbering options, although none of them offer the Page x of y format.
If you want to insert page numbers via fields, use Quick Parts. You'll find this option in the Text group, also on the Insert tab. From the Quick Parts dropdown list, choose Field.
After selecting Field, specify one of the page numbering fields: Page and NumPages. You can combine these to create the form Page x of y. This process is probably familiar to you, but finding it via Quick Parts is new to Word 2007 and 2010. It's probably an appropriate spot, but it might not be the first place you look.Displaying page numbers in Word 2007 and 2010 is still easy. The Number of Pages option isn't hidden, but you might have trouble finding it.