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5 Quick Ways to Fix Outlook Sync Issues

Having synchronizing issues in Outlook? Worried why your Outlook is not showing new mails? This can be due to wide variety of reasons which you will be finding answers in this article. Most probably this issue in Outlook can happen due to OST or PST file issue which can easily fixed using PST repair software- Remo Repair for Outlook PST.

Synchronization is a built-in process in Microsoft Outlook that happens regularly whenever the PST files or OST file gets updated. That is as and when Outlook sends and receives emails or any other folder is updated, simultaneously it even updates the Exchange Server about these changes. For example, when you edit, delete, send or receive an email in Microsoft Outlook, the changes will also be updated on the Microsoft Exchange Server.

What causes synchronization errors in Outlook?

Sync error are commonly encountered among many Outlook users. At times, this process might get interrupted and your Outlook may fail to sync emails successfully.

Depending on your email account settings, the amount of Outlook data, and several other reasons, the synchronization process may be stopped due to a large OST file.

In such an instance, Outlook won't let you receive and send emails from your Outlook profile. You need to fix the issue at the earliest to avoid further damage. So, follow the steps given in the below section and know how you can fix the Outlook email sync issue. However, before trying to fix, convert the OST file to PST using OST to PST converter tool and backup the Outlook data.

Check the following points before going ahead with the solutions 

  1. Verify if your inbox is full 
  2. Verify your Junk folder 
  3. Verify your inbox settings and remove any unnecessary filters 
  4. Log out and log in to your Outlook 
  5. Increase your message sending and receiving limit
5 Ways to Fix Outlook Sync Issues
Check If Your OST File Is Synchronized Or Not
Change Profile Settings To Sync Outlook
Re-synchronize Outlook folders To Email Sync Issue
Empty The "Sync Issues \ Local failures" Folder
Fix your OST or PST file To Repair Outlook Email Sync Issue

Quick Solution:
In case you are facing Outlook sync issues due to a corrupt or damaged PST file and are looking to restore your precious Outlook data, we recommend you to repair your Outlook data file using Remo Repair Outlook. Download Remo Repair Outlook for fixing issues with your Outlook data file right away.

Why is my Outlook not synchronizing?

  1. Due to improper network connection
  2. Faulty IMAP/POP3 settings 
  3. Damaged PST file 
  4. Sync issues between offline changes to PST file 

For any of the above-mentioned any reason if your Outlook is not syncing, make use of the below-listed solutions. 

How To Check If Your OST File Is Synchronized Or Not?

Before trying to fix the Outlook sync error with the given methods, check if the sync issue is between your Microsoft Exchange Server (MES) mailbox and the OST (offline folder) file. To check whether your OST file is being synchronized or not follow the below steps:

If you are not aware, all the Imap accounts in Outlook will sync with the Online server

Step 1: Open Outlook and right-click on any of the folder present in your Inbox, Sent Items, Drafts, etc.

Step 2: Select Properties and click on Synchronization tab and look for Statistics for this folder

Step 3: Now, check the stats of the Last Synchronized data.

If the statistics are not recent, then follow the troubleshooting methods Outlook OST file is inaccessible to fix the sync error.

Change Profile Settings To Sync Outlook

If the number of items in the Server folder contains section (is same as) with that of in the Offline folder, your Outlook folders are properly synched. If the number of items differs in both the sections then, you will have to verify the profile settings. For these just follow these steps:

  • Open Outlook -> File tab and select Account Settings
    open outlook and go to account settings
  • In Account Settings, just click Data Files
  • Now check whether the Mailbox – account name is set to default or not. If it’s not, then make it as default.
  • After completion, just click the Email tab -> Mailbox – account name, and click Change
  • Just make sure that the box next to Use Cached Exchange Mode is selected and then click OK
  • To save all the changes just click on Close and exit the Account Settings window
  • Close and reopen Outlook
  • Incase if you find the your Outlook profile is corrupt, you might have to repair Outlook profile.

Note: If you are facing any errors while working offline in Outlook, read this informative write-up.

Re-synchronize Outlook folders To Email Sync Issue

Re-synchronizing your Outlook folders can quickly fix this error. Follow the steps given to know how you can re-synchronize Outlook.

Step 1: Click on Tools tab and select Options.

Step 2: In the Options dialog box, click on the Mail Setup tab.

Step 3: Check the Send immediately when connected box in the Send / Receive section.

Step 4: Click Send/ Receive tab and select Perform an automatic Send / Receive when existing.

Step 5: Click the Close button to exit the window and then OK.

This method will quickly fix the Outlook email sync issue.

Empty The "Sync Issues \ Local failures" Folder

If you cannot at all synchronize any of the Outlook folders then, try to empty the Sync Issues \ Local Failures folder in your Outlook. You might not be able to see this folder unless you set it as visible. To make this folder visible, follow the steps given below.

Step 1: Click on the Folder List icon that is situated at the bottom left-hand corner of your Outlook.

Step 2: Under the All Outlook Items tab, look for the Sync Issues folder.

Step 3: Hit the "+" button and expand it to view the three sub-folders namely Conflicts, Local Failures and Server Failures.

Step 4: Empty the Sync Issues folder by selecting all the messages and removing them and exit Outlook when done.

Fix your OST file To Repair Outlook Email Sync Issue

If this fails to solve the issue then your OST file may be corrupt. To fix this, you will have to create a new OST file and try to re-synchronize all the folders. For this, you have to first rename the old OST file, create a new one and then synchronize the new .pst file with the Microsoft Exchange Server mailbox. By doing this, your Outlook sync issues will be fixed. This will fix Outlook 2013 Sync issues, sync issues in Outlook 2016, 2010, and previous versions.

However, if you create a new OST file, the sync issue might be fixed, but you will lose your entire OST data. Instead, try to repair your corrupt OST file.

To repair your corrupt OST file, download the Remo Repair Outlook PST tool and launch it. Specify the location of the corrupt OST file and that’s it, the tool will perform the entire repair process and gives you a healthy OST file, with data intact. When done, your Outlook will function properly without any Outlook sync error.

Free Download For Windows

Also sometimes, your server unexpectedly terminates the connection and you receive an error message like “Outlook Error Number: 0×800ccc0f". This generally can happen while sending/receiving an email. At such a time remember that fixing error 0x800ccc0f in Outlook is easy.

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Tony Landry

Tony Landry is a Web Content Editor at Remo Software. He loves to write, edit, and manage content for users trying to troubleshoot and fix problems on Windows, Outlook, storage drives and Cloud storage networks.

He has published more than 200 articles in Remo Software blog. He actively engages in research and problem-solving techniques to consistently generate great web content. Fixing various hardware problems on computer and storage devices along with a great knack for fixing Outlook errors, Tony is also the fun-time IT guy for all his work friends. He lives in the San Francisco Bay Area and enjoys cycling.

Articles: 189

4 Comments

  1. I really wish somebody would create a plug-in of some kind for Outlook to display the local vs server count of items and offer to sync a folder up/down plus the folders below. Seems like syncing is sort of serial with not too many threads running at the same time (O365 64-bit version). I’ve got a 6.8GB PST that I imported into a new O365 mailbox on a 150M connection, normal i5 machine, 8GB RAM and I’m finding that Outlook doesn’t really sync the subfolders. This user has so many folders making it even more difficult. I know MS throttles but on day 4 here and it doesn’t even seem close.

    • Hi Nicholas,
      Remo Repair Outlook for PST can repair both OST and PST all you have to do select the OST file you want to repair or you can just click on the Find All Your PST Files button. This will list all the available Outlook data files on your computer. You can then select the damaged OST file to fix it. Thank you.

  2. Thank you so much for this. I have been struggling for about a week with Outlook sync issues and other issues due to a few botched Microsoft updates. This worked for me and I am totally happy all is working well now.

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