Is there any quick way to delete the standard emails trash files.
Keep in mind that your phone's name for certain specialized folders, such as trash, differs from what Office 365 will call it. In Office 365's web interface, and Outlook, the folder is named Deleted Items, and they are kept in sync with your phone's comparable Trash folder. So look there to see the correlation. And yes, deleting from your phone will be dramatically slower than deleting from your computer or the web, the latter being fastest as it's connected directly to the server.