Resolving IMAP Synchronization Issues in Outlook 2013/Microsoft 365

Microsoft Outlook users would know that they can configure external email accounts and clients to it using Account Settings. The configurations it supports are IMAP, POP, Microsoft 365 and Exchange. It is also true that with this accounts configuration in Outlook application, one can send or receive messages and keep with email updates using Send/Receive feature in the Outlook interface. This updating of emails is known as the synchronization between Outlook application and Microsoft 365 account.

But nothing goes smooth for always. The configuration process of Outlook and accounts can go well if the process is followed accurately whereas the synchronization can get affected due to different factors like Anti-virus scanning inflicts, effect of security updates like KB2837618 and KB2837643, MS Office updates, Incorrect Root Folder Path and Settings, etc.

Read also: Free Methods to Convert OST to PST File

All these factors not only affects the synchronization between Outlook and accounts like Microsoft 365 but also can cause more issues as mentioned below.

  • Error messages while performing IMAP synchronization with Outlook like
    “You do not have appropriate permission to perform this operation.”
  • Complete crash down of Outlook application on its launch.
  • Failure in receiving the emails from the recipients
  • Non-display of Auto-reply settings
  • Calendar data scheduling is not available

The synchronization issues cannot be ignored and users have to look out for some solution. First try restating your system and the Outlook application. If it does not go well, move to the following solutions.

Try These Solutions

To fix IMAP synchronization issues in Outlook 2013/Microsoft 365, users can perform some manual tricks themselves. We are going to explain the involved process in each one of it one after another.

  1. Disabling Anti-virus Scanners: If any Antivirus software is running currently, then we suggest you to disable the scanner temporarily as while performing its action of scanning the Outlook emails, it may conflict the synchronization of the IMAP account emails with the Outlook or Microsoft 365.
  2. Re-installing MS Office 2013: This workaround can be performed as a trial. Go to the Control Panel on your system and under Programs and Features section, right-click on MS Office 2013 and select Uninstall option. Confirm it again. Wait until the un-installation gets completed. Once completed, re-install the MS Office 2013 on your system. Now try synchronizing the emails.
  3. Providing Root Folder Path: You can try setting the Root Folder path for your emails to be synchronized yourself. This is to be done to verify that the Root Folder path is correct or not. Users are recommended to take a backup of the emails to be synchronized as the risk of data loss is involved.

    Run these steps in sequence

    1. Launch the Microsoft Outlook application. Navigate to File > Account Settings > Account Settings.
    2. Select your IMAP account in the opened Account Settings page. Click Change option.
    3. Next, click on More Settings option.
    4. In the opened Internet E-mail Settings dialog box, switch to the Advanced tab.
    5. Go to the Folders section, and type INBOX (in capital) against Root folder path option. Click OK.
    6. Now go to your Outlook application and click on Send/Receive option to start the synchronization process.
  4. Try Synchronizing Send/Receive Groups: On your Outlook home page, go to Send/Receive tab and then click on Send/Receive Groups option. Next, click on Define Send/Receive Groups and create a New Group with assigning a name to it. Select the IMAP account and ensure the following options are selected.
    • Send mail items
    • Receive mail items
    • Get folder unread count for subscribed folders
    • Download complete items including attachments for subscribed folders

    Then click on OK. Next, select the newly created Group name and then ensure the following are selected.

    • Include this group in Send/Receive (under When Outlook is Offline section also)
    • Schedule an automatic Send/Receive under 30 minutes

    Finally, click OK and start using Send/Receive option to receive the configured IMAP account emails again.

    Note: Make sure all the IMAP folders are subscribed by visiting the Mail section in Outlook and then when right-clicking INBOX folder, selecting IMAP folders option, user should be clicking on Query option to generate a list of folders. To subscribe any folder, just click on it and then select Subscribe option.

  5. Uninstalling KB2837618/KB2837643 Updates: As mentioned earlier the synchronization glitch is due to the new security updates in Outlook – KB2837618 and KB2837643, users should uninstall these updates as soon as possible. Go to the Control Panel on your system. Search for these updates (if available), select it and right-click on it. Select Uninstall option to initiate the un-installation. Once it is completed, hit on Send/Receive option in the Outlook to start the synchronization.
  6. Modifying Folders Settings: There are some settings in the Outlook application either set by default or by the user earlier which may be causing issues in the synchronization. For that, user can look out for the setting personally and disable it on his end.
    1. Start your Microsoft Outlook 2013 application.
    2. Go the IMAP account folder (inbox) and right-click on it. Then select IMAP Folders option.
    3. In the opened IMAP Folders dialogue box, clear (unselect) the checkbox saying When displaying hierarchy in Outlook, show only the subscribed folders. Click OK.
    4. Next, click on Send/Receive option to check if this solution worked out or not.

If any of the above methods do not work to resolve the problem, then you need to remove and add the IMAP account again in the Outlook. But remember that, do not install such updates which hamper the performance of Outlook. In some cases, the messages may get corrupt due to bad or incomplete installation of updates and the data will be inaccessible. To remove corruption, you need to use the ESEUTIL tool further to recover the data.

These were the basic solutions which can help the users to resolve IMAP synchronization issues in Outlook 2013/Microsoft 365. It is possible that these solutions works for you or sometimes not. The reason behind not working of the above solutions could be corruption in the OST files. Fixing OST synchronization error(s) could be due to corrupted files which interrupts connection of IMAP account with Outlook 2013 and sometimes leads to Outlook crash even making the data completely inaccessible.

What is the utmost solution?

In such situation where nothing is going right for you in fixing synchronization issues in Outlook 2013, we would like to present the most reliable and proficient OST to PST tool. The tool recovers data from corrupt or orphaned OST files easily. It allows users to save all the recovered data into PST format so that users can access it directly in the Outlook application. It works with all Outlook and Exchange Server versions widely. So, now you can get rid of all corruption and other errors related to OST files if you own this advanced software.

Download Now


IMAP synchronization issues in Outlook 2013 and Microsoft 365 with factors responsible for it are discussed primarily. Then some relative native solutions are explained to get rid of the problem and finally the Best OST to PST software to recover data from corrupted files is suggested.


  1. I used this blog methods to resolve IMAP synchronization issues in Outlook 2013/ Microsoft 365. I re-installed my MS Office 2013 and successfully synchronized IMAP data.

  2. With this systematic methods I synchronized IMAP in Outlook 2013. Thanks to the writer for creating this blog to solve my problem of synchronization.

  3. I was not receiving emails correctly and then to solve an IMAP synchronization issue I used above method and succeed. This blog helps me to know about other effects and how can overcome them. A big thanks to the creator.

Leave a Reply

Your email address will not be published.

14  +    =  15