With a huge file of things accumulated that I wrote with Microsoft Word '97 and then Word 2004 holding up my upgrade to Lion the question is: how to change every document to Pages. More recently I’ve gone from Pages ’08 to Pages ’09, which is currently v. 4.1.
Here’s the solution, unless you can come up with something easier that doesn’t cost $$$. Click on the title of a document in the folder to highlight it, then Control Click on the title. On the little drop down menu choose Save As and select Pages.
(Pages is a good writing tool for me, with one exception: it doesn't know how to alphabetize a list, or "sort" as Word refers to the procedure under the heading Tools.)