Aimed at developers and enterprise customers, users will be able to get their hands on the device later this year.
Six new markets can now pre-order the device, which will allow users to see computer-generated holograms in the real world.
From last month, HoloLens is now available to pre-order in the UK, Ireland, France, Germany, Australia and New Zealand. This now takes the total number of markets to eight, as it was previously launched in the US and Canada in March.
No specific date has been set for the UK release, but Microsoft has said that these will be shipped later this year.