Defender is updating both it's Engine and it's Defs:
Engine Version: 1.1.5302.0
Definition Version: 1.71.26.0

?:-)
Tim
--
Windows XP SP3 [Tried and True!]
Windows Vista [Your Joking, Right?]
Windows 7 [Determination Pending ?!?]

The link is as follows:
32-bit
http://download.windowsupdate.com/ms...df6b51e5d5.exe

Size is only 1.9 MB, and it will not trigger a system restore point
[As of this moment: (11:28am CDT USA)
the "pushed" version and the portal version are in sync ]

As always, if you need the Full Engine and Full Defs update
[for example after a new install/reinstall of Defender]
you can get it at the Microsoft Malware Protection Center:
http://www.microsoft.com/security/portal/
https://www.microsoft.com/security/p...tions/ADL.aspx
The full MPAS-FE is currently 11.6 MB

?:-)
Tim