Sync issues sometimes become a major cause of several errors in Microsoft Outlook. If you want to get some knowledge regarding this sync issue folder then this article is for you. Here we will also show you the best methods to Resolve Sync issues in Outlook 2021, 2019, 2016, 2013, 2010, and other editions.

MS Outlook allows users to use their email profiles of Exchange,, and IMAP accounts. After building a connection with Outlook Client to the mail server users gets an OST file on their local drive.

These OST files save all user’s mailbox server data locally and enable users to edit data in Offline mode. After re-connecting with the server Outlook sync all the modified data from OST files to the mail server.

Fastest Solution to Repair Corrupt OST files & Outlook Error

Quickly repair OST files and fix Outlook sync issues easily with eSoftTools OST Recovery Software. In simple clicks repair corrupt OST files and retrieve data from single as well as multiple OST files. Recover all lost items from corrupt OST files like- emails, contacts, calendars, etc. In addition, export OST file items like- PST, EML, EMLX, MSG, HTML, MHTML, MBOX, vCard, and more file types.

DOWNLOAD NOW       Purchase Now

What is Sync Issues Folder in Outlook?

Outlook creates a Sync Issues folder to save the synchronization issues details and error logs. It saves copies of unsent messages or items.

Make the sync issue folder visible, by clicking on the three dots from the bottom of the navigation pane and then select the “Folders” option for making it visible.

After doing this, users will see the three inner subfolders that are available in the sync issue folder: –

  • Local Failure: – It contains the information of emails that are not synced from OST files to the mail server.
  • Conflicts: This folder stores several copies of mail items that Outlook cannot sync with the server and tries to send them repeatedly.
  • Server Failures: – Inside this folder Outlook saves the email items that are not synced with the mail server.

Problem users face with Outlook Synchronization issues: –

  • Outlook starts facing problems in sending and receiving new emails.
  • Duplication of emails and other items in Outlook profile and mailbox server.
  • Missing some Outlook items from OST file or Mail server even after synchronization.
  • Occurrence of different unwanted errors in Outlook.

Main reasons behind sync issues in Outlook

  • Corrupt Outlook data file/ profile
  • Internet connection failure
  • Oversize OST files
  • Incompatible Outlook Add-ons
  • Hardware or software-related issues
  • Improper Outlook application closing

Method to Resolve Sync Issues in Outlook 2021, 2019, 2016, 2010, & other editions

Because of sync issues, several problems can enter into Outlook profiles. For this reason, users have to fix these issues. Below we have shown some best techniques to fix sync issues in Outlook: –

Solution 1: – Check and Fix your Network Connection

The poor internet connection breaks the connection of the Outlook profile with the Mailbox server. This connectivity issue interrupts Outlook in synchronizing data or sending and receiving new items.

To fix this problem, check your internet connection by using the “Trouble-shooter” utility. Check the details of the network connection and fix the detected problem.

If, with this fix is unable to provide you the best results then use the next methods shown below.

Solution 2: – Sync Mail Folder Manually

If Outlook is unable to automatically sync email profile data with the server, then users can do it manually by this method: –

  • Open Outlook and right-click on the folder that you want to sync or update.
  • Choose “Properties”, then click on “Clear Offline Items” and hit on “OK”.
  • After clearing Offline items, move to “Send/Receive” tab and click on “Update Folder

Solution 3: – Configure New Outlook profile

Configure a new Outlook profile and replace the existing profile and its data for fixing sync issues. Apply these steps for performing this task: –

  • Open the control panel, search, and select the “Mail” option.
  • Click on “Show Profiles” from the next opened screen.
  • Hit on “Add…”, then add your profile name and click on “OK”.
  • Configure your Exchange, Office 365, or IMAP Server account, and click on “Next >> Finish”.
  • After account configuration, select “Always use this profile” and choose your newly configured account from the dropdown list.
  • Lastly, click on OK and Restart MS Outlook application.

Solution 4: – Recreate Outlook Data File (OST)

By rebuilding OST files users can also fix Outlook sync issues. This job users can simply accomplish by these steps: –

  • Launch Outlook, click on File > Account Settings > Account Settings.
  • From the next screen, click on Data Files tab and select your email profile.
  • After profile selection, click on “Open File Location” and move to the OST file location.
  • Cut this OST file and paste it to any other safe location and delete OST file from this location.
  • Restart MS Outlook and get new OST files and start synchronizing data from the mail server.

Solution 5: – Repair Corrupt OST files

Corruption in OST file is also one of the major reasons for the Sync issue. By repairing Corrupt OST files users can fix this problem. For repairing OST files users can use both manual and automatic methods shown below: –

Method 1: – Manually repair OST file with “ScanPST.exe” tool
  • Launch ScanPST.exe (inbox repair tool).
  • Click on “Browse” and select the OST file (which is linked with your Outlook profile).
  • Hit on “Start” and begin the scanning process for checking corruption errors.
  • After scanning completion, click on “Repair” and start repairing OST file errors.
Method 2: – Automatic tool repair corrupt OST files

Automatically repair corrupt Outlook OST files with eSoftTools OST to PST Converter/Recovery software. Fix all OST file corruption issues with this single tool. From corrupt OST files recover Outlook mailbox items and save them to new PST files.

This tool also directly exports Outlook mailbox items from OST files to Office365, Gmail, Yahoo,, and IMAP accounts.

DOWNLOAD NOW       Purchase Now


Sync issues can create several problems in Outlook- OST file size increases, mailbox item duplication, problems in sending/receiving new items, and more. All these problems affect the performance of Outlook. So, users should fix them by using the above-mentioned methods. Use the above-discussed method and resolve Sync Issues in Outlook 2021, 2019, 2016, 2013, 2010, & other editions

Post a comment