Wanting to keep same URL structure for website

We are moving from a proprietary CMS to WordPress for our 80+ page website. We are very concerned about losing the page rank status of our pages. Currently, our pages are in the format of http://www.eaglecmms.com/products/productname.htm. WordPress displays this as http://www.eaglecmms.com/products/productname/ Any suggestions or advice is appreciated!