I have a Galaxy Note 3 and I use the built-in email client, probably made by Samsung. I prefer to use Thunderbird for organizing all my emails; of course this on on a PC. I have gmail, msn (outlook), and yahoo, the king of compromised email accounts. All software I use, all my phones, everything is set to IMAP and everything should sync from/to the server. Everything works as desired, with the exception of my MSN account. For some reason after I delete emails, whether it be from a web browser and the msn website, or thunderbird, they still appear on my phone, in the inbox, if I have ever once received the email. I have double checked all my settings. Additionally, I have been moving emails, creating folders, and all operations work and sync flawlessly among all devices; except msn still shows the 107 "read" messages in my inbox on my mobile telephone. I began the quest to find an internet solution and all I find is forum's, but its like this problem is so hard to explain to people, I don't understand why. Tina and that Bland guy seem to understand the problem, they posted about the same problem I am having, any other posts before mine that claim a solution, simply do not understand the problem. I can delete emails using my phone and they are trash, server side too! Deleted emails from my phone sync to all devices, thank you very much, but the converse is not true. I'm not here to post a solution, but to post the same problem. I have a few insights, though. I think there is something to go on with bland's post about using POP email settings. That may solve this issue and I would only use POP and this account with my phone. But I would have to unblock POP service from my msn account settings to do this, and I don't want to, I have let POP go, I said goodbye. So the only other insight I have is that my problem has something to do with "Microsoft Exchange Server" and the default note 3 email client. Interestingly, I deleted all emails in my inbox on the server, then, from my phone, I moved the emails from the inbox to a separate folder, they did not appear on the server, and deleting them from my phone caused no issues; but the work involved was arduous, it took like 3 clicks, and possibly a shimmy.