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Microsoft Breaks Custom Forms in Outlook on Purpose for Security Sake, Supplies Workaround

Amid the recent regular security updates for September, Microsoft’s patches seemingly broke things yet again – at least in respect to those that use custom forms in various versions of Microsoft Outlook.

Since the patch bundle release and subsequent customer complaints, Microsoft has put together an explanation and a workaround.

The update for September disables the custom form script by default. For customers that need to still use this function, a registry modification is required.

Details here: Custom form script is now disabled by default

This change affects all supported versions of Microsoft Outlook, but not all at once. Microsoft says that…

  1. Monthly Channel (Current Channel) will start supporting the registry keys in the update scheduled for September 18th release build 16.0.8431.2079.
  2. Semi-Annual Channel (FRDC) supports the registry keys with build 16.0.8431.2079.
  3. Deferred Channel supports the registry keys with build 16.0.8201.2193.
  4. Deferred Extended status is TBD.
  5. Insider Fast status is TBD.
  6. Insider Slow supports the registry keys with build 16.0.8431.2079.


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