I decided to upgrade Wordpress 2.2 to 2.63 today and was trying to suss the best way to do it. Found all sorts of convoluted instructions and was just about to give it a miss when I stumbled on the Wordpress Automated Upgrade plugin.
Wow! Impressive. Upload it, activate it and follow the prompts – simple as that. 5 minutes was all it took and the only problem I had was with an outdated plugin (”Blogroll Autolinker”) that didn’t work until I upgraded it (through the Plugins panel). Everything else was intact and working smoothly including the database, all articles, links and layout. It even does the backup of the original site for you.
Recommended!