Google Chrome has broken Microsoft Exchange OWA

Recent updates to Google Chrome have broken functionality in Microsoft Exchange OWA.  The below is a temporary fix until Microsoft releases an update.

Until May 2015, a registry workaround is available to restore the showModalDialog() method. To enable the showModalDialog() method, the following steps can be used:

  1. Download ADM Policy Templates for Windows (if you want just the US English one, grab this chrome.zip)
  2. Extract the downloaded files, then navigate to Start | Run: gpedit.msc
  3. Navigate to Local Computer Policy | Computer Configuration | Administrative Templates
  4. Right-click Administrative Templates and select Add/Remove Templates
  5. Add the downloaded chrome.adm templates of Windows via the dialog for the specific language (English is EN-US)
  6. Once the template is added, a Google Chrome folder will appear under ‘Classic Administrative Templates’
  7. Select EnableDeprecatedWebPlatformFeatures setting in the right column. Right-click the setting and select Edit
  8. Edit the EnableDeprecatedWebPlatformFeatures as shown below:
    1. Paste in the following string value: ShowModalDialog_EffectiveUntil20150430
    2. Click OK on the Show Contents dialog
    3. Click Apply and OK on the Enabled Deprecated Webplatform Features dialog
  9. Restart the Google Chrome browser and type chrome://policy in the address bar
  10. You should observe that this deprecated feature is now enabled.