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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.

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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.

Outlook and third-party apps may conflict with each other, especially the security apps, such as antivirus, anti-malware, or firewall.If the antivirus program isn't Outlook friendly, you may experience certain issues while using Outlook.Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.They were both connected to office 365, when suddenly one day it said "updating inbox" and that's it.Please provide the output from the following commands so that we can check to make sure your settings are set up correctly.

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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, flush DNS and re-sync Outlook 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 repair corrupted OST in Outlook 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&nbsp