Alternatively you can upload your own Windows image by doing these steps.
1 - upload your VHD disk to Azure (https://learn.microsoft.com/en-us/azure/virtual-machines/windows/prepare-for-upload-vhd-image)
2 - create a VM from your VHD disk (https://learn.microsoft.com/en-us/azure/virtual-machines/windows/create-vm-specialized-portal)
Have a look at this page for more details https://support.microsoft.com/en-us/help/2721672/microsoft-server-software-support-for-microsoft-azure-virtual-machines. Depends on which version your are looking for, Microsoft does not support operating systems that are past their End of Support date.