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What do I need to know about synchronization issues folders in Outlook?

The synchronization issues folders contain logs and items that Microsoft Outlook has been unable to synchronize with your email or SharePoint servers. Having messages in these folders is a normal function of Outlook as they are error checking mechanisms that the program uses to sync your email to email services. 

There are four synchronization issues folders that appear in the navigation panel when you view the folder List. They can be located in Outlook's folder view, which can be accessed by doing the following:

  1. Click on the three dots in the bottom left of your Outlook email program or type "CTRL+6"
  2. Click Folders, which will bring up a list of the folders in your account
  3. Scroll to the Sync Issues folder and expand it to also see the Conflicts, Local Failures, and Server Failures folders.

The following describes the four folders and the items you may find in each folder. Use an items infobar to open a separate window for support.

  • Sync Issues | Contains all of the synchronization logs. This folder is helpful if Outlook is having trouble synchronizing — for example, there is an item that you see in the Office 365 OWA (Outlook Web Access), but not in Outlook — or you are not getting new mail in some folders when using Cached Exchange Mode.
  • Conflicts | Contains all the multiple copies of conflicting items in your mailbox. An InfoBar at the top of the original item advises you that a conflict for this item exists. The conflicting item is stored in the Conflicts folder. Clicking the InfoBar will bring up a list of conflicting items and allow you to resolve the conflict by determining which item you want to keep.
  • Local Failures | Contains all items that could not be sent to your server. If you have made changes to items while working offline, and then notice that your changes are not appearing in another Outlook client, your Office 365 OWA, or your SharePoint list, you should check this folder.
  • Server Failures: Contains items that Outlook failed to synchronize from your mailbox or SharePoint server. When Outlook cannot synchronize the item from the server, it moves it from its original folder location into the Server Failures folder. The contents of this folder are available only when you have a connection to your server. If you are missing expected emails, check this folder.

Synchronization Log Messages

If you have created an Unread Mail search folder in Outlook (see How do I use search folders in Outlook?) and begin seeing messages in it like the one below, please follow these steps:


  1. Access your folder list within Outlook by clicking on the three dots in the bottom left of your Outlook email program or typing CTRL+6
  2. Expand Search Folders, right-click Unread Mail (after you've created your Unread Mail search folder), and choose Customize This Search Folder...
  3. Select Browse
  4. Uncheck Search subfolders and the top level email account.  Select the Inbox folder and all other desired folders to sync new messages with the Unread Mail folder, then click OK