I followed the upgrade instructions as Johnny listed them and my board and only mod, mail2forum, worked perfectly. After I ran the upgrade php I got a message reminding me to delete the install directory. I did what I was told and all is happy.
I was going from 2.013 to 2.015
Thanks for great install help!
Peter Florance
3 different lunarpage hosted sites
Well, phpBB has done a decent job of getting the updates out quickly, before it
wreaks too much havoc. The problem is upgrading, however all the recent upgrades have been minor, and very few changes made to very few files.
One thing to keep in mind, like MS, phpBB is probably the largest distributed forum out, and therefore is the most sought after for finding vulnerabilities.
IMO, once SMF gains more popularity, you will see vulnerabilities found in it as well. I'm in no way knocking SMF. I plan on installing it myself.

BTW, I have updated the tutorial for manually upgrading phpBB, which can be found here:
http://www.lunarforums.com/viewtopic.php?t=16952