Claws Mail is the free and open source emailing platform that saves email in MH mailbox format through plug-in and impeccably supports Windows and Mac systems. With it a user can easily manage the mails and can characterize them accordingly. However, while working with this email application the real matter of concern is the facing performance issues when doing network tasks. Consequently, these days many professionals prefer to adapt MS Outlook to maintain communication with client. In case, you too are one of them and looking to migrate MBOX files of Claws Mail to PST format, then it is advised to take assistance from external tool like Kernel for MBOX to PST Converter software.