Mac Outlook not Syncing with Office 365 – Error Resolved

admin ~ Modified: 08-07-2021 ~ Technology ~ 3 Minutes Reading

Users often face the issue when their Mac Outlook not syncing with Office 365. You may send, receive, delete the emails, or may add a new contact but it will not show up on other devices due to the inability of Mac Outlook to sync with Office 365. Temporarily you may try to reboot your device and launch Outlook again but that does not provide an effective solution and neither does is it convenient to keep restarting your computer now and then.

“I am facing a strange issue with my Mac Outlook for the past several months. I send, receive, delete, add data from Outlook on my computer but later when I try to open it using my other devices, it does not show. While I am using it, there is no such error shown by Outlook regarding its syncing process. Even after I delete my emails on my computer, they are still sitting in my mailbox when I try to access them using another device. How can I overcome this syncing error in an easy way?”

Mac Outlook not Syncing with Office 365 – Issue Resolved

This is quite a common issue that occurs while using Outlook for Mac. Try the following solutions:

  • First, clear all Outlook cache.
  • Try clearing the license for Mac Outlook.
  • Go to Outlook Add-ins and try to reactivate them.

If nothing works, you can use the OLM to PST Converter that helps you to migrate the data from Outlook for Mac to Office 365. It helps you in numerous ways such as:

  • Bulk migrate data from Mac Outlook to Office 365
  • Selective migration feature available for all categories.
  • Apply Application Impersonation to automatically transfer data.
  • Export into individual or single user using the Admin account.
  • Maintains the metadata and folder hierarchy of the source.
  • No size limitation on the file transfer.
  • Supports Mac Outlook 2019, 2016, 2011 versions.
  • Apply date-based filtering for desired file migration.

Steps to Migrate the Data

It is the best option to migrate your data when you face Mac Outlook not syncing with Office 365 error and need to transfer the files.

  1. Download and install the software on your system. Click on “Add File” to browse and load them.

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download tool

2. Preview the files in various view modes and choose the files to export.

preview mac outlook data

3. Now, choose Office 365 as your destination and click on Advanced settings.

office 365 option

4. Here, apply user impersonation. It allows you to permit the Admin account in O365 to access other accounts in the same domain. You must provide the credentials of this account and apply the date filter.

user impersonation

5. You can also choose to provide the details using a CSV file.

mac outlook data

6. In the next screen, give the destination mailbox address to export your data to and export your files.

mac outlook to office 365

Related: Import Contacts to Outlook


In this article, we have found various methods to solve the Mac Outlook not syncing with Office 365 error. Users must not worry as they can now rely on the solutions mentioned in the above passages. You can be tension-free as the software mentioned in this article is a genuine service provider and ensures you the best results.