I'm upgrading from JIRA 4.4.4 to JIRA 5.0.x and migrating from Windows 2003 32-bit version to Windows 2008 64-bit version of JIRA. According to the upgrade instructions, I need to start out with a new clean database but I'm not sure why. Can I still use my JIRA 4.4.4 database for JIRA 5.0.x or did the schema change again requiring a d/b change?