Exchange Office365 Auth - Modern auth system browser support
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:
- Stop the program and the service that is running
- Add this under the <appSettings> </appSettings> tags...<add key="Exchange.UseEmbeddedBrowser" value="false"/>
- Restart the application and uninstall/re-install the service