The Exchange Online Fiddler Extension
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Latest commit f83c1b2 Jan 15, 2019

Current Release Information

Version 1.0.63 addresses performance concerns when running in 'live trace' mode. Minimal features in the extension now run in this mode. Load a SAZ archive into Fiddler to see all functionality.


The Exchange Online Fiddler Extension

This inspector is intended to help with troubleshooting issues with Outlook and Office 365 / Exchange Online. With Fiddler installed, install this extension to alter the standard Fiddler UI:

  • Add column 'Response Time'.
  • Add column 'Response Server'.
  • Add column 'Exchange Type'.
  • Add column 'HostIP'.
  • Add column 'Authentication'.
  • Add an 'Exchange Online' response inspector tab -- Exchange related information.
  • Add an 'Office365 Auth' response inspector tab -- Authentication related information.
  • Add an 'Exchange Online' menu to turn off/on extension, extension features and other options.
  • Colourisation of sessions upon loading a .SAZ file.
  • Colourisation of sessions upon live tracing.

For more information click here:

To submit issues or suggestions click here:

To download the extension click here:

EHLO Blog post: