1. Mac OS is a computer operating system developed by Apple.This is a operating system with beautiful interface, however, to own a the computer of Apple with this operating system, you need to use a lot of money, normally with the double price than that of common computers using Windows operating system.Fortunately, you can experience the Mac OS right on your computer by installing a Mac OS.
2. Virtualbox lets you run Mac OSX within Windows by creating a virtual machine, which is a program that simulates a normal computer. To create a virtual machine, open up Virtualbox and click 'New' on the upper left. Give your new virtual machine a name, and choose 'Mac OS X' for the OS Type.

Open up your VirtualBox application and click New. Create a New VM Click Expert Mode and select the following options then click Create. Type a suitable Virtual Machine Name.

Important Note
Please DO NOT use this thread to ask specific questions about X or Y not working. This thread SHOULD be about basic installation for bare minimum functionality. If you have a specific question/issue/problem, start a new thread.
Here is what works and what doesn't work with different OSX guests on different VBox versions.
Setup
Basic template for 'Mac OS X $version (64 bit)', should be sufficient for a start. For unsupported guests you could use the generic 64-bit option, or for 10.10 (until it is supported) the 10.9 (64-bit) template. After that you can make modifications till things don't break. See Modifications later.
Booting
(10.x# stands for CPUs > 1)
VirtualBox 5.x - Supported guests
VirtualBox 5.x - Unsupported guests
VirtualBox 4.x - Supported guests
VirtualBox 4.x - Unsupported guests
When Slow is mentioned, it means that in my system there is a lot of lagging, even moving the mouse or typing at the Terminal. This is only during the Installation phase. Deleting or renaming '/System/Library/Extensions/AppleIntelCPUPowerManagement.kext' later, usually fixes a lot of issues.
Known issues

• 4.3.8 works only if you issue the command (see ticket #12736):
  
• 10.4, 10.5 are not officially supported.
• The number one trouble maker is the '/System/Library/Extensions/AppleIntelCPUPowerManagement.kext' extension. You should delete or rename it. Many guests have all sorts of weird issues (high CPU, Kernel Panics, etc.) or don't boot at all. Updates to the 'latest and greatest' OSX may overwrite this. Doing so will allow you to increase the number of CPUs in some of the guests.
• You'd better disable audio in the VM settings. If it is detected, it is prone to kernel panics on the guest (10.6) and performance issues.
• ClamAV is known to cause high CPU usage. A workaround:
  
• For 10.5, in order to update to 10.5.8:
  
  • Create a clone of 10.5 basic install (let's call them original and mirror).
  • Mount the HD of the original as a secondary HD on your mirror.
  • Run the 10.5.8 update on your mirror, but install it on your original.
  • Delete or rename '/System/Library/Extensions/AppleIntelCPUPowerManagement.kext' from the original HD.

Host(s) info

• Mac model: MacBookPro 8,3 - 2.3 GHz Intel Core i7.
• Cores: 4 physical, 8 virtual.
• RAM: 16 GB.
• Graphics: AMD Radeon HD 6750M, 1 GB VRAM.

• Mac model: iMac 11,3 - 2.93 GHz Intel Core i7.
• Cores: 4 physical, 8 virtual.
• RAM: 16 GB.
• Graphics: AMD Radeon HD 5750, 1 GB VRAM.

Modifications
My typical modifications are as follows (all of them are optional):

• Decrease memory in 10.5, 10.6 to 1024 MB. Doesn't need more than that.
• Remove Floppy. Change the boot order to CDROM, HD.
• Increase CPUs to 2, if you can (see Booting section earlier).
• Increase VRAM to 128 MB, enable 3D acceleration.
• Network, add 4 adapters (HostOnly, Internal, Bridged, NAT).
• Enable Bidirectional Shared_Clipboard and Drag'n'Drop.
• Change the resolution to 1280x1024 (see the manual, Ch. 3.12.1 for more options):
  
• Give your guest a valid serial number (copy it from 'About this Mac' dialog box):
  

Updates
This post will be updated as more information becomes available. Please do submit your experiences. Personally, I will try with the latest 4.2.x and 4.1.x VirtualBox series.

1. 2014.05.21: rpmurray: OS X 10.4 (Intel) works as a guest up through VB 4.3.6.
2. 2014.05.21: Added information about 4.1.32, 4.2.24, 4.3.0, 4.3.2, consolidated table, added rpmurray's host configuration.
3. 2014.10.20: Added information about 4.3.16, 4.3.18. Broke the table into Supported and Unsupported guests. Added information about OSX 10.10 (Yosemite).
4. 2016.04.06: Finally, added information about 5.0.16. Will try to update previous 5.x versions. Supported guests was getting too wide, so it broke in two.

Background: I tried to make a fresh installation of a 10.5 guest on a 10.6.8 host with VB 4.3.12. It failed. I went back several VB versions to see what works and what doesn't. This post is the result of this exercise.

Windows, macOS – which one do you want to use today? On a traditional setup, you’re stuck with one or the other. But with virtual box, you actually have macOS on a Windows PC.

It’s the freedom that computer users have enjoyed with Linux and other operating systems.

But Apple has made it difficult to install their operating system on anything other than their own hardware. All of that is changing, and Virtual Box is responsible for it and the rise of the Hackintosh.

New to hackintosh? Learn more about it in our what is hackintosh? overview.

Note: A lot of people will be able to get a mac virtual machine one Windows running smoothly, but sound doesn’t seem to work well. That’s really not an issue because you’ll still be able to access all of your apps and software.

I also recommend that you have access to a real Mac. You might be able to find some distributions of the High Sierra ISO online, but there is always a risk when downloading from an unofficial source. Instead, borrow a Mac from a friend, or use your own and download the High Sierra OS from the App Store.

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Check out our high sierra installation guide for hackintosh

Everything You Need to Get Started with Installing macOS on VirtualBox

Before we go through the steps on how to install macOS on Virtual Box, let’s get everything together that you’ll need to get started.

1. Open up your Mac
2. Go to the App Store
3. Type in “High Sierra”

You’ll want to search for your desired operating system (we’ll be using High Sierra), and Download it.

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Note: You’ll need a decent computer to be able to run Virtual Box. Your computer will need to meet these minimum requirements:

• Dual core processor
• 4GB Ram or higher
• 64-bit

If your computer doesn’t meet these requirements, you won’t be able to run macOS properly. You’ll be able to download VirtualBox from the official website. I’m not going to go through the installation process, as the website will have all of the information you need to be able to install VirtualBox.

I do recommend that you read all of the documentation and ask any questions that you have in the community section of the website.

VirtualBox 6.0 was just released, so it’s definitely a great time to get started with your own macOS.

Extract macOS Sierra

Make sure you’ve downloaded High Sierra, and then you’ll want to run a few commands from your terminal . You’ll be able to open the terminal at: Applications > Utilities > Terminal. Once inside of the terminal, you’ll want to run the following commands:

Go to your desktop and rename the file, removing the “.cdr” extension. You need this extension to read “.iso” for it to work properly.

You’ve successfully created your own ISO file so that you can bootup your macOS.

The next step is to copy the file over to your Windows machine (using a large USB drive seems to work best). This file will be mounted in your virtual machine later on in the article, so it’s very important that this step is completed successfully.

Creating a mac Virtual Machine on Windows

You’ll want to create a virtual machine, and this is really easy. You’ll open up VirtualBox and click New. You’ll want to have the following parameters selected or entered before clicking Next.

• Name: High Sierra
• Type: Mac OS X
• Version: Mac OS X (64-bit)

Pay attention when selecting the version because you may find that High Sierra is offered as a version when you go to install it. But if it’s not, you can just choose the settings I listed above and they should work fine.

You’ll then be proceeding through all of the settings.

When you come up to the RAM setting, you’ll want to be generous. VirtualBox requires a minimum of 4GB or RAM to run, but the more the better.

Why?

You’ll want to provide at least 4GB to your macOS, or 4096MB to be precise. A general rule of thumb is that if you can spare it, supply more RAM to your virtual machine. RAM will allow the operating system to put more information into memory and retrieve it faster.

For better overall performance, supply as much RAM as you can.

The next steps are also important, and they’ll include:

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• Hard Disk: Choose the “Create a virtual hard disk now” setting.
  • Choose VDI when choosing the hard disk type.
  • Choose Fixed Size instead of Dynamic for added speed.
  • Set the size of the drive to at least 25GB.

You’ll now have your virtual machine using the RAM and disk space properly, and you’ll have to work your way through a few screen prompts before having everything setup properly.

Configuring Your VirtualBox to Run macOS High Sierra

We’ve made a lot of progress so far, and now it’s time to configure your virtual machine properly. You’ll see in the main window of VirtualBox that “High Sierra” is listed. Click on this and then click on the “Settings” button.

You’ll want to go to “System” and make sure that the following are unchecked on the Motherboard tab:

• Floppy
• Network

Click on the Processor tab and make sure that you have 2 or more CPUs set for your virtual machine.

The next few settings are rather simple:

• Display: Video Memory with a minimum of 128MB
• Storage: Click “Empty” and then click on the CD at the top right. Choose your High Sierra ISO file

Now you’ll need to click “Ok,” and save all of the changes you’ve made. Close out your VirtualBox now.

Apple is very strict on the system that their operating system runs on, so it’s very important that you do your best to configure your virtual machine in such a way that it tricks the installer to thinking you’re on a retail machine.

We’ll now be going into the Windowscommand prompt.

You’ll do this by:

• Clicking the Start Menu
• Typing “Command Prompt”
• Right-clicking on the Command Prompt desktop app
• Choosing Run as administrator

It’s very important to follow all of the following command prompts exactly. Your goal is to run each command, one by one, hitting the Enter button and waiting for the command to complete successfully.

Remember that VirtualBox needs to be closed before running these commands, or it won’t work properly.

You have to make sure that the virtual machine is properly named “High Sierra” for this method to work. If not, you’ll be able to go back and make changes to the name to get everything to work properly.

Once all of the commands are completed, and there are no errors, you’ll then be able to open up your VirtualBox and get macOS High Sierra installed properly on VirtualBox.

It’s a long process, but we’re almost done with your installation.

Running VirtualBox and the macOS Installer

You’ve almost learned how to install macOS on VirtualBox entirely, and we’re on the home stretch. You’ll want to open up your VirtualBox and then click on your virtual machine that you set up earlier.

Now, click “Start.”

There will be a lot of information displayed on the screen as everything starts running. I recommend stepping away from the machine and letting it run for a few minutes before coming back. Some errors can hang for 5 minutes or longer.

If you’ve done everything properly, you can be confident that the installer will boot properly.

You’ll eventually be presented with the option to pick a Language. If you’ve reached this point, you’re doing very well and are almost ready to run your macOS.

The next steps can be followed:

• Choose your desired language, and click
• Click “Disk Utility” and then
• Click “View” and then “Show All Devices.”
• Click on your empty virtual drive that has been setup and click “Erase.”
• Choose the following settings:
  • Name: Macintosh HD
  • Format: Mac OS Extended (Journaled)
  • Scheme: GUID Partition Map
• Click “Erase” and close Disk Utility when the process is complete.
• Click “Reinstall macOS.”
• Click “Continue.”

You’ll come up to one point where you’ll be asked to choose a hard drive, and you’ll want to select the Macintosh HD partition that you just created with the Disk Utility.

We’ve successfully copied all of the files on the virtual machine, but we’re not done just yet.

Exit your virtual machine and then go back to your virtual machine’s settings. You’ll need to change up your Storage settings. Click on your ISO for High Sierra in the “Storage Tree.” You’ll click that CD icon just like we did earlier and then choose “Remove Disk from Virtual Disk.”

You need to do this to unlink the ISO from your virtual machine.

Start up your virtual machine and you should come across a black screen with the EFI Internal Shell. You’ll want to look for FS1. If this is listed in yellow, click on the virtual machine and then type fs1: and hit the Enter button.

You should be in the fs1 directory.

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Type in the following commands:

1. cd “macOS Install Data”
2. cd “Locked Files”
3. cd “Boot Files”

Now we’ll run the installer by running: boot.efi and hitting enter.

If everything goes well, you’ll come across a graphical installer and will just have to work through the prompts. The virtual machine will reboot eventually and then you’ll need to go through the settings and the rest of the setup process.

Soon enough, you’ll be right inside of macOS, where you’ll be able to start using your mac virtual machine on Windows.

Having a virtualbox mac OS is the easiest method of using mac as and when you need it. In addition, using virtualbox is far less complicated than the dual boot hackintosh method we have looked at previously.