Script Download: The script is available for download in Microsoft Script Browser for Windows PowerShell ISE. You need to install the Script Browser application first, and search for the script sample title.
This VBscript sample shows how to configure the size limit for both (.pst) and (.ost) files in Outlook 2013.
In Outlook, as the recommended PST file size is less than 2GB, some users want to increase thier Outlook achive files size, but according to the MSKB 832925, the steps seems significantly complicated. The script can help user configure the size limit for .pst and ost files in Outlook, it could save the tedious process.
You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery
If you are having an OST file that quite large in size, then I would like to suggest a software that I used to resolve the same issue. You can make use of OST Recovery Tool. This software converts your OST file into PST and while making the conversion, it provides
you with option of splitting your PST file into number of files as per size. You can explore more features and get this OST Recovery Tool by going to the following link: -http://www.exchange.ostrecovery.co.uk/