How about doing it manually? Make new ones and move folders from one to the other. This gives you full control over what gets where, uses only a well known Microsoft program and is free.
Three very pleasant points, I'd say. Still I expect some ad-like answers trying to sell you third-party programs that offer you higher costs and less flexibility. Your choice then.
Don't forget to compact all source folders to make them smaller after moving things out.
My Outlook mailbox have so many large pst file and i have problem from this at the time of open my mail so i want to split all pst file .
Have you any suggestion for this problem.?