Apple mail occasionally doesn't remove the message from Outlook.com
Over the past few months my Apple mail, both on my iMac and MBP doesn't always remove the e-mail from the server which is Outlook.com. My mail settings on both Macs are to remove the e-mail from the server immediately. This is annoying only because Apple mail will often download the message again regarding it as a new message, if it is still on the server.
Could this be a problem with apple mail or the server outlook.com?