I have had an IMAP account running for about 30 months that I and a co-worker access from several different laptops and tablets. Recently, emails I was sending from this account on my laptop stopped showing up in my Sent folder on my laptop (although I can still see these sent emails in the Sent folder if I log into our mail provider via web interface). I have tried deleting the account in Thunderbird and recreating it, but this has not solved the problem. The recreated version has populated the Inbox correctly on my laptop, but has not recreated the Sent folder. I have refreshed the list of folders this account is subscribed to. The refreshed list shows the Sent folder, and I am subscribed to it. I am a little worried that I may have used a different display name for my recreated account from what the original was, but the email address is definitely the same for the recreated account. Would having a different display name make any difference?