There are so many third party application available in Web that can easily transfer GyazMail data to Outlook PST format. I would like recommend such a very efficient professional MBOX to PST Converter software, which can be downloaded as free trial from here http://www.free.convertmboxtopst.com/ or http://www.mboxtopst.org/
Migrate MBOX to PST http://www.mboxtopsts.com/ software is and advanced and powerful email migration tool, it ensures accurate and flawless conversion of MBOX formatted files into Outlook and provides options to save the MBOX file data in PST, MSG and EML format. Get full detail http://www.mboxtopstconvert.recoveryfiles.org/
Migrate MBOX to PST http://www.mboxtopsts.com/ software is and advanced and powerful email migration tool, it ensures accurate and flawless conversion of MBOX formatted files into Outlook and provides options to save the MBOX file data in PST, MSG and EML format. Get full detail http://www.mboxtopstconvert.recoveryfiles.org/
A lot of tools available to perform the task, but I would suggest to use MBOX to Outlook Converter program. The tool is eligible to find out and open MBX files of GyazMail automatically from the default location and export emails into one of user required formats such as: PST, EML and MSG formats. Download free edition of the tool to check working procedure: http://quickdata.org/mbox-to-pst.html
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How to transfer GyazMail data to Windows Outlook mail client.?