Install Windows Server 2012 R2 on the VM

Note: This is part of a series on SQL Server 2014 In Memory. Start here

Download Windows Server 2012 R2 Preview here

Once you download the ISO file, open the Virtual Machine and point to the file:

Use the prompts and install. Select the DataCenter with GUI option. Also use the Custom Install option.

You will need the Guest Additions. Download within the VM using this link. You will need guest additions to create a share with your host and few other things - very handy if you want to share files between the host and the VM etc.

You can add shared folder once you install Guest Additions via the "Shared Folder" menu on the VM (make it permanent and Auto-mount):

Then you can see the shared folder under \\VBOXSVR:

Also on the VirtualBox menu enable Clipboard sharing. You may need to restart the VM.