Fixed bugs in version 3 (most recent at top):
* <strike>{{bug|524315}}</strike> shutdown hang, high cpu, no open imap connections, no ldap connections but has live, blocked ldap threads
* <strike>{{bug|494014}}</strike> shutdown hang, high cpu, no open imap connections
* <strike>{{Bug|497598}}</strike> hang on shutdown appending msg to imap folder via a filter