roundcube upgrade from 0.3 to 0.5

[kostas_dak]

I'm planning to upgrade from 0.3 to 0.5
Is this possible ?
Except the backup ( DB and Files ) what else i must take care ?

The 0.3 version displays all the time "connection to IMAP server fail"  is this fixed in new version ?

Thanks alot
    Kostas