Replacing the root folder can possibly cause the loss of saved emails in the account.
Visit your Account Settings, then Advanced for the mail account that you are having trouble with.
Apart from Outlook, many email clients support IMAP (Internet Mail/Message Access Protocol) in addition to POP (Post Office Protocol) for email downloading messages from the server. Note: Make sure you select IMAP in the Account Type drop down menu under Server Information. This will land you on the POP and IMAP Account Settings window. IMAP Synchronization Issues in Outlook 2013 and Office 365 The problem might not be in the way you configured your IMAP account on Outlook 2013, but might be in some update or plug-in installed frequently.
A good rule of thumb is to add about 5 minutes for every 2-3 extra mail accounts until you reach 30 minutes.
An alternative method would be to set 1-3 “high priority” accounts in a send/receive group which checks for new message every 10 minutes and all the other accounts in a separate send/receive group which checks for new messages every 30 minutes (or even longer)You can set the send/receive interval in; When you have a message stuck in the Outbox, Outlook could end up trying to send that message until it succeeds.
When it is truly stuck (for instance because it is too big), this of course will never work.
As you may noticed, Microsoft Outlook tends to respond slower to your commands, as time goes by over your Outlook installation.
We use to compare Microsoft Outlook with Microsoft Windows: they both needs constant tweaking and optimization, unless you are willing to reformat your disk and to reinstall Windows.
But on the Outlook case, reinstalling it can bring lots of headaches and critical data may get lost during the process.If you cannot avoid the update, we will provide you with further steps regarding a temporary fix for the issue.This issue with Microsoft Outlook 2013 and Office 365 will cause IMAP folders to not successfully synchronize, therefore inhibit your ability to receive new mail to your inbox.If you are willing to leave all of these Outlook windows open during your session, you will receive your IMAP-account emails very quickly.Microsoft is conducting an online survey to understand your opinion of the Technet Web site.This article tries to explain you how to make Outlook faster and better, without reinstalling it.