"There are lots of open bugreports for KMail 1 which is out of maintenance. These bugreports have to be checked. If they are still valid for KMail 2, the "product" field in bugzilla should be changed to KMail 2. Bugs that are no longer valid (for example because they have been fixed) should be closed.
Note: coordinate with the KMail developers to get write access to the KMail 1 bugreports.
Prerequisites: A system with latest KDE and KMail installed. Having used KMail before is an advantage."