Converting OST files to PST is the most challenging task and there are many other reasons why users need to transfer OLM files to PST. But, due to the limitations of the manual method users face challenges to convert OST files in bulk with complete data security. To convert the OST file successfully and to tackle all the problems of the manual method we need to use professional tools like Aryson OST to PST converter. This tool allows you to convert OST files into multiple file formats like PST, DOC, MSG, HTML, etc. This tool comes with an easy-to-use GUI which makes this tool easy to use for everyone. However, this tool maintains the data hierarchy throughout the conversion process. However, this tool maintains the data hierarchy throughout the conversion process and automatically removes the duplicate OST file on the basis of BCC, Subject, From, to, etc. 

Professional method to transfer Outlook OST file to Office 365

- Download and Install the OST to PST converter in your system.

- Then select the file to convert and then hit the next button.

-  After this select the file or folder to preview and click on the next button. 

-  Now select the mail client to which you want to transfer your Outlook OST file.

- Then select the path to save button and click on the convert button to start the process. 

If you want to read about the many other free methods to convert OST to PST then read this article 03 Free Methods to convert OST to PST.