Large sized PST files are always difficult to manage. Due to having large sized files, MS Outlook becomes very slow and starts hanging all the time. Unluckily, large sized PST files are prone to corruption. And sometimes large PST files can become unusable due to corruption. All these situations take place due to large PST files, but we can resolve this problem by splitting them. If we split or divide an oversized PST file into small parts, they can easily be managed. By splitting PST files into smaller parts, we can avoid file corruption. MS Outlook does not provide any feature or inbuilt function And if you try to do that manually, they could be damaged. Though the files can be compressed manually, but you cannot split them. You need to take help of a third party tool. <br />
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Check this link for solution :- http://www.recoverfilesdata.com/split-pst-file-tool.html