Thank you for your answere. I am not sure what Thunderbird is so I will stay with Outlook. If I swith to IMAP instead of POP3 will that have an effect on my IPhone?
Thank you for your help. It looks as though I need to change to IMAP as I have multiple devises such as a smart phone, ipad laptop and a desktop computer. All of which I use to access my emails. I will change over and keep my fingers crossed that it is successful. Thank you for your help and advice.