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Exchange Office365 Auth - Modern auth system browser support

By default, Mail Attachment Downloader an embedded browser when modern auth is requested as discussed in this blog post.

In cases where you would like to configure this to instead use a system browser, you can change  *.config files (MailAttachmentDownloader.exe.config MailAttachmentDownloaderService.exe.config) and in the Mail Application Downloader installation directory as follows:
  1. Stop the program and the service that is running
  2. Add this under the <appSettings> </appSettings> tags...<add key="Exchange.UseEmbeddedBrowser" value="false"/>
  3. Restart the application and uninstall/re-install the service 

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