2003 vintage means you won't be able to install anything close to a current software release on it since it probably only has 256mb of RAM in it. Current software requires 512mb, though any controller made in the last year or 2 probably has 1Gb. Best you can load on it is 9.0.3.x, if you can find it, since you can't even pull that from the Software Dowloads site on Mitel Connect. If you're a Mitel partner, you should be able to get a demo kit that's actually able to run the current version for cheap.