To change the OST file size limit you need to convert the OST file. Now, you might be thinking that converting an OST file is quite a difficult task because converting an OST file manually is difficult and time is taken to task. So, here you will get the complete information to convert the OST file by using the professional method all you need to do is download the software Aryson OST to PST converter. This OST converter helps you to convert OST files into multiple file formats like PST, MBOX, HTML, MBOX, etc. If you want to migrate OLM files then you can easily migrate OST files to a number of email clients like Office365, Gmail, Thunderbird, Yahoo mail, and many other file formats. However, it maintains the folder hierarchy throughout the conversion process. 

If you want to split the PST file then you can easily split the large PST file by using the PST file splitter. You can split the PST file according to your size and numbers.