The two patches are necessary because Vista is subject to the same security holes addressed in other Microsoft products during the huge patch delivered on 8 August.
Security patches are not normally issued for beta software, because no one is supposed to be using it in a critical environment. But Microsoft has issued patches for Vista before.
The patch, rated 'critical', covered a similar WMF flaw that hit the company's other operating systems a week earlier.
The vulnerability was in the Graphics Rendering Engine and could allow an attacker to gain control of a target machine.
Some commentators have suggested that Microsoft has issued the patches to pre-empt security software companies creating 'we've found a hole in Vista' stories.
Geoengineering on the sea floor near glaciers would form a new ice shelf to prevent melting
Alterations in capillary blood flow can be caused by body position change
Curiosity rover is in 'normal mode' but not transmitting scientific data back to base
NatWest outage comes a day after Barclays' IT systems shut out customers and staff