How to resize Mac OS Boot Camp partitions without data loss

When I bought a MacBook Pro laptop about a year ago I made it dual-boot to be able to use both Mac and Windows. As my main operating system at that time was Windows and Mac was used only for educational purposes, I partitioned my HDD the following way: I gave 120Gb of 160Gb drive to Windows and only 40Gb to Mac OS.

Recently I completely switched to Mac OS and Mac partition very quickly ran out of space so I started looking for a solution to shrink Windows partition and give all the freed space to Mac. Unfortunately, Mac OS doesn’t allow resizing boot partitions, even when you boot from a Mac DVD and run disk utility from there.

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