Math equations that are created by Microsoft Equation Editor 3.0 are no longer supported on Microsoft Office 2010 SP2 Onward since January 2018 due to security issue. Such equations will not be displayed when the "MT Extra" font is missing from the local system. This update will install the "MT Extra" font enabling the display of the math equations that where created by Microsoft Equation Editor 3.0.
If you own a non Subscription based version of Microsoft Office (This update is not supported by Office 365) you are lucky!
Just run Windows Update or you can just download the font below:
32bit Update: Download
64bit Update: Download
The App MathType Let's you edit Equation Editor 3.0 equations without the security issues which caused its removal from Office 2010 onward. MathType is now a component of the Wiris Suite. You can download a 30-day trial at: http://www.wiris.com/equation_editor/microsoft
If you still have Microsoft Office 2007.
You can insert and edit new equations using the editor built into Office version 2007.For more information about inserting and editing equations, see Write, insert, or change an equation. However, you will not be able to edit existing equations that were inserted using Equation Editor 3.0 in that manner.
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