Once the system is connected to the Internet and the server is available, follow the next solutions to troubleshoot and fix the problem. They were both connected to office 365, when suddenly one day it said "updating inbox" and that's it. You should always use NTLM over Basic authentication, as Basic sends the username and password in the clear, and NTLM is Windows Authentication. On Exchange 2013, you also have a new option called Negotiate, which is recommended.

Check Disk Space

Outlook alternates between "Updating this folder" and "Trying to connect". A manual send/receive fails with a "Connection to Microsoft Exchange is unavailable message". I loaded an old mail profile for the same user account and it worked fine, when I switched back to the initial profile it started to work fine as well.

• This problem should only occur on the initial synchronization of a folder that is larger than 4 GB.
• I loaded an old mail profile for the same user account and it worked fine, when I switched back to the initial profile it started to work fine as well.
• Then, click on the Update Folders under Send/Receive tab to check if the synchronization issue is fixed and the folders are updating.
• On Exchange 2013, you also have a new option called Negotiate, which is recommended.
• I reimaged the machine of the lone person that continued to have this problem and Outlook has been working OK for the time being.
• Once the system is connected to the Internet and the server is available, follow the next solutions to troubleshoot and fix the problem.
• For those utilizing the classic (old) Outlook application, this section addresses issues specific to this version.
• In this article, you will learn the reasons that can trigger the ‘Outlook 365 stuck at updating mail folders’ issue and the solutions to effectively troubleshoot and resolve the issue.
• Since some weeks everyday another user calls and tells me he doesn't get mails.

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If the antivirus program isn't Outlook friendly, you may experience certain issues while using Outlook. To check whether the antivirus app is preventing Outlook from updating the Inbox or Outbox folder, temporarily disable the antivirus program and restart Outlook. If the issue is resolved, exclude Outlook processes, Outlook data files, Office 365 sync problems and login fixes and folder locations from your antivirus program. The SVC record had to be updated in DNS, which was the cause of the autodiscover issue in my last post.

Internet connectivity issues

This problem should only occur on the initial synchronization of a folder that is larger than 4 GB. If the folder size is initially lower than 4 GB but then grows to above 4 GB over time, you will not see this problem through normal folder synchronization. After looking into Microsoft Outlook Email Repair Tool Online it more, as the user above stated, this seems to be cache related so I nixed that on the shared box too. Follow these solutions to fix the Outlook stuck at updating the Inbox and Outbox folders issue. It stores a copy of mail items on the mailbox server in the OST file on the local machine. The changes made in Outlook are stored in the OST file and synchronized frequently with the mailbox server.

Check Outlook Email Account Settings

The next thing to check is the Virtual Directories and the Client Access fix MFA prompts not working Server Autodiscover URI and fix them accordingly too. All InternalUrl and ExternalUrl’s should be setup using the hostname mail.domain.com (assuming mail.domain.com is the OWA URL that you chose). You need to make sure your OutlookAnywhere and AutoDiscover settings are setup properly along with Split-DNS. OutlookAnywhere and Split-DNS are vital for future-proofing your Exchange configuration and making it work properly now, regardless if you use Exchange 2007, 2010, or 2013. For Exchange 2013, OutlookAnywhere is a requirement and Split-DNS is Best Practice.





Outlook may fail to synchronize changes stored in the OST file or retrieve information from the mailbox server due to problems with the application, system, or Outlook OST data file. As a result, Outlook may fail to update the Inbox or Outbox email folder. Also, any email sent to you or sent from your Outlook client will not be received or delivered. However, you can follow the solutions discussed in this article to find the cause and resolve this issue in Outlook. Outlook and third-party apps may conflict with each other, especially the security apps, such as antivirus, anti-malware, or firewall.



These troubleshooting tips can help you resolve common issues that prevent the new Outlook inbox from updating properly. If you continue to experience problems, consider reverting to the classic Outlook application or contacting Microsoft Support for further assistance. Is she able to properly access the shared mailbox through OWA? In this article, you will learn the reasons that can trigger the ‘Outlook 365 stuck at updating mail folders’ issue and the solutions to effectively troubleshoot and resolve the issue.

Why is my Outlook Inbox not updating?

If you are running out of storage, make some space by moving some files from the storage to another folder or volume. You may also archive the OST mailbox to reduce the mailbox size. I reimaged the machine of the lone person that continued to have this problem and Outlook has been working OK for the time being. However, the problem cropped up again yesterday for a new user. The connection to Exchange drops, reconnects every few seconds or so until eventually the issue clears up. Interestingly, during this time I was unable to connect to OWA using a different mailbox on the affected client computer.