Microsoft is removing code-based Sandbox Solutions in Office 365

Microsoft will shut down support for Sandbox Solution in Office 365 on August 31st 2016.

This is the error message:

Unhandled exception was thrown by the sandboxed code wrapper's Execute method in the partial trust app domain: An unexpected error has occurred.

It may impact your business if your SharePoint Online solution is using code based sandbox solutions.  It will perhaps stop working all together if you don’t act now and transition to an add-in-model or client-side model.

If you don’t act now, it will mean the following attributes will stop working:

  • Event receivers
  • Feature receivers
  • Workflows (coded)
  • InfoPath forms (if using code behind the forms)
  • Web parts (if coded using sandbox code)
  • Any branding code with assemblies

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