Outlook for Mac Not Syncing With Exchange Server

Updated on September 06, 2023 by Deepika Singh

We all know that Outlook for Mac connects to Exchange on a Mac system that allows offline work. Synchronization is performed among the server and client applications so that the change is reflected on the other edge if a modification is made on either the server or the client side.

This synchronization gets affected in many scenarios and times. As a result, mailboxes don’t get updated on both the server and client sides, necessitating the need to resolve Outlook for Mac not syncing with Exchange Server. Keep reading; you will get this error's reasons and additional fixes.

Possible Causes of Outlook for Mac Isn't Syncing with Exchange Server

It can be frustrating if you're using Outlook for Mac, which needs syncing correctly with your Exchange Server. Here are some common reasons why this might be happening:

Outlook Version Compatibility: Ensure you're using a version of Outlook for Mac that's compatible with your Exchange Server. Updates might be needed.

Large Mailbox: If your mailbox is vast, it can take a while to sync. Outlook might appear unresponsive during this time.

Sync Frequency: Check your sync settings in Outlook. You may see recent emails later if they sync less frequently.

Firewall or Security Software: Security software or firewalls can sometimes block Outlook from connecting to the Exchange Server. Make sure Outlook is allowed through your security software.

Email Profile Corruption: Sometimes, your Outlook profile can get corrupted, causing syncing issues. It would help if you recreated your profile.

Add-Ins and Extensions: Third-party add-ins or extensions can interfere with Outlook's regular operation. Try disabling them to see if it resolves the issue.

Sync Conflicts can arise if you use multiple devices to access your email. Ensure you're not trying to simultaneously access the same email from different devices.

Storage Space: Check if your Mac's storage is running low. If it is, this can affect Outlook's ability to sync.

Proxy Settings: If using a proxy server, ensure that Outlook's settings are configured correctly.

Outdated Software: Ensure Outlook and your Mac's operating system run the latest updates. Older software versions may have syncing issues that are fixed in updates.

Exchange Account Settings: Review your Exchange account settings in Outlook to ensure they match the recommended configuration from your email provider or IT department.

6 Verified solutions to fix Outlook for Mac Not Syncing with Exchange Server

As you've read the above reasons, you've probably realized that various factors can lead to the error. Just like that, there are multiple solutions according to the causes. Some of the possible solutions are described as follows:

Solution 1. MS Outlook should be updated on your Mac device

If you are experiencing issues such as Outlook for Mac not connecting to Exchange, the program may need more critical updates. To update the program, perform the following steps:

  • 1. Start MS Outlook and navigate to the Help option and then the "Check for Updates" option.
  • Update MS Outlook to fix Syncing issue with Exchange Server
  • 2. Choose "Automatically" in the Ms Auto Update window that appears. Also, under the Check for Updates tab, pick an appropriate choice.
  • Step 2
  • 3. To download and install the most recent updates, select the "Check for Updates" option.

Solution 2. Check whether Outlook is in offline mode or not

If you get Outlook for Mac not connecting to the Exchange server issue, ensure that Outlook isn't working offline. This is the most fundamental test you can make before exploring any other strategy.

Outlook for Mac Not Syncing with Exchange Server

First, access the Outlook menu and check whether working offline is allowed. If it's enabled, press it to turn it off.

Solution 3. Recheck and ensure that Outlook for Mac is connected to Exchange Server

The fundamental reason for the Outlook sync troubles is that Outlook for Mac frequently fails to sync to the Exchange server. Outlook for Mac requires a steady connection to the Exchange Server to execute synchronization. To validate this connection, perform the following steps:

  • 1. Run Outlook and choose Accounts from the Tools menu.
  • Fixing Mac Outlook not Syncing with Exchange
  • 2. Inside the left sidebar, look for the Exchange account. If the account's indicator symbol is orange, there is an issue with the exchange connection. You can re-establish the relationship by contacting your Exchange server administrator.
  • Check Exchange Server connection

Solution 4. Clear Cache data

This strategy is proper when one or more Exchange folders are not synchronized with Outlook, but the rest of the Exchange folders are synchronized with Outlook. Here's how to solve it.

  • 1. Confirm that Outlook for Mac and Exchange Server are connected.
  • 2. Right-click on the Exchange directory that isn't syncing and choose the Properties feature.
  • 3. Next, go to the General menu and select the Empty Cache button.
  • Clear cache data to fix Mac Outlook Syncing with Exchange
  • 4. Confirm to see if the folder is synced and if new objects are being added to it.

Solution 5. Recreate Outlook for Mac file

Whether there is an error with the Outlook for Mac database, Outlook for Mac is not synchronizing with the Exchange Server. This approach is only applicable to Outlook for Mac 2011. You cannot manually fix the Outlook database because updates are conducted automatically in recent Outlook for Mac editions.

  • 1. Quit Outlook for Mac and other Microsoft Office programs.
  • 2. Track down and launch the Microsoft Database Utility. It is default installed in the Applications/Microsoft Office 2011/Office directory.
  • 3. Start the utility and identify the database to be rebuilt. Then press the Rebuild button.

Use Professional Software:

If the above solution didn't make any fixes, it would be most accessible and most effective for you to convert the Outlook for Mac OLM files into PST files to get back your necessary files. For this purpose, you should use professional software, and the Regain OLM to PST Converter software is the one. It is the best approach for effortlessly converting Mac Outlook OLM files to PST format.


Some of its highlighted features are:

  • Regain OLM to PST Converter allows to addition of multiple OLM files to convert into PST file format without any restriction on the number and size.
  • Along with converting OLM to PST, you can also save into EML, MBOX, HTML, EMLX, MSG, RTF, PDF, and MHTML in prominent file format.
  • The metadata properties and folder hierarchy remain properly maintained hence users get the data in the same manner.
  • You may export OLM files with all attachments, such as images, documents, and media files, using the program.
  • One of the most essential features of this program is that it guarantees the privacy of your email information and provides a 100 percent guarantee of data protection.
  • Regain is confident of its software hence a free trial version of the software is also available to download.

Follow the below-given steps to convert OLM files into PST:

  • 1. Install and run the "Regain OLM Converter" application.
  • 2. Now, browse the OLM file that you want to convert.
  • Regain OLM Converter for resolving issue like Outlook for Mac Not Syncing with Exchange Server
  • 3. In the preview, review all the scanned mailbox items.
  • Step 3
  • 4. Choose the appropriate location and format. Here our task is to convert it into a PST file so select the PST option. Also, you can set a size limit using the split option.
  • Step 4
  • 5. Click the "Save Data" button to save the converted file.


In this comprehensive guide, we've tackled the frustrating issue of Outlook for Mac failing to sync with the Exchange Server. We've highlighted the significance of this synchronization process, which keeps your email communication seamless. However, when it falters, it can be a real headache. The good news is that many factors can lead to this problem, and we've provided practical solutions for each.

We emphasized the importance of updating your Outlook for Mac and Mac operating systems, ensuring they are in harmony with the Exchange Server. Moreover, we introduced you to a professional tool—the Regain OLM to PST Converter—as a reliable solution for converting your Outlook data to a different format, all while safeguarding your email information. Must download the free demo version and explore the tool on your own.


Frequently Asked Questions:

Q1: Why is my Outlook for Mac not syncing with the Exchange Server?

Ans: There can be various reasons, including outdated software, large mailbox size, sync frequency settings, firewall issues, etc. It's essential to diagnose the specific cause to find the right solution.

Q2: How do I update Outlook for Mac?

Ans: To update Outlook for Mac, open the program, go to the "Help" menu, and select "Check for Updates." Follow the prompts to download and install any available updates.

Q3: What should I do if Outlook for Mac is in offline mode?

Ans: If Outlook for Mac is offline, go to the Outlook menu and check if the "Work Offline" option is enabled. If it is, click on it to turn it off and bring Outlook back online.

Q4: How can I ensure Outlook for Mac is connected to the Exchange Server?

Ans: To confirm the connection, open Outlook, go to the "Tools" menu, select "Accounts," and look for your Exchange account in the left sidebar. If it has an orange indicator symbol, there may be an issue with the connection; contact your Exchange server administrator.

Q5: What if I need help with the solutions for my syncing issue?

Ans: If you've tried all the solutions mentioned in the blog and still face syncing problems, consider using professional software like the Regain OLM to PST Converter to convert your Outlook data to a different format for a fresh start.