How to Fix Outlook Synchronization Issue? -

Outlook synchronization issues can occur for various reasons, such as network problems, corrupted data files, or incorrect account settings. Here are some troubleshooting steps to resolve synchronization issues in Outlook:

1. Check Internet Connection

Ensure you have a stable internet connection. Unstable or slow connections can cause syncing problems.

2. Restart Outlook

Close Outlook completely.
Reopen the application and check if the issue persists.

3. Check Mail Server Status

Verify that your mail server is operational.
For Office 365 accounts, check the Microsoft 365 Service Status page to confirm there are no outages.

4. Verify Account Settings

Go to File > Account Settings > Account Settings.

Select your account and click Change to review the settings.

Ensure that incoming and outgoing server details are correct. Refer to your email provider’s documentation for the correct settings.

5. Update Outlook

Go to File > Office Account > Update Options > Update Now.

Install any available updates.

6. Disable Cached Exchange Mode

For Exchange accounts:

Go to File > Account Settings > Account Settings.

Select your account, click Change, and uncheck Use Cached Exchange Mode.

Restart Outlook.

7. Repair Outlook Data Files

Outlook 2016/2019/365:

Close Outlook.
Open the Control Panel and navigate to Mail > Data Files.

Select your account and click Open File Location to locate the .ost or .pst file.

Use the Inbox Repair Tool (Scanpst.exe) to scan and repair the file:
- The tool is typically located in:
  C:\Program Files (x86)\Microsoft Office\root\OfficeXX (XX depends on the Outlook version).
Follow the prompts to repair the file.

8. Create a New Outlook Profile

Go to Control Panel > Mail > Show Profiles.

Click Add, create a new profile, and set it as the default profile.

Reconfigure your email account in the new profile.

9. Check Add-Ins

Open Outlook in Safe Mode by holding down Ctrl while launching the app or typing outlook.exe /safe in the Run dialog.
Disable problematic add-ins:
Go to File > Options.

Select Add-Ins > COM Add-ins and click Go.

Uncheck unnecessary add-ins.

10. Clear Offline Items

For folders not syncing:

Right-click the folder and select Properties.
Go to the General tab and click Clear Offline Items.
Then, click Send/Receive to resync the folder.

11. Rebuild the OST File

Close Outlook.
Navigate to the OST file location:
- C:\Users\<YourUsername>\AppData\Local\Microsoft\Outlook
Rename the .ost file to .old.
Restart Outlook, and a new OST file will be created.

12. Check for Large Mailbox or Corrupt Emails

Delete or archive old and unnecessary emails, especially those with large attachments.
Check for stuck items in the Outbox and delete them.

13. Contact Your IT Team or Email Provider

If none of the above resolves the issue, the problem might be on the server-side. Reach out to your IT administrator or email provider for further assistance.

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