Outlook 365 not responding when opening shared mailbox. Outlook crashes when you start it.
Outlook 365 not responding when opening shared mailbox Users can't send mail to the shared mailbox. However, a faster computer that has a smaller mailbox and a fast network connection may be able to open 10 or more shared folders or mailboxes. Mar 18, 2025 · Shared mailboxes are a great way of managing large volume of emails and quickly responding to customer, client, or public queries. I have been granted delegate rights to someone's email box however I am not able to open his mailbox after the account setting… Jul 23, 2024 · I logged into the shared mailbox, from Microsoft® Outlook® for Microsoft 365 MSO (Version 2406 Build 16. The issue also isn’t limited to one person / account at the clients. Users are configured with personal user mailbox and secondary user mailbox (50Gb in size) which is not… We're on cached mode but do not have the "download shared folder" checked. Select photo in the top right, Open Another Mailbox, enter shared mailbox name, and a new tab opens with the outlook envelope icon animating. I don’t get the “…ost file in use” error, but “no connection to exchange” when trying to open a shared mailbox. After reinstalling, now it freezes constantly, even when not in use. May 20, 2025 · Shared mailboxes are used when multiple people need access to the same mailbox. Autodiscover works fine. We would like to use it more, but the slowness and crashing is really affecting our ability to be productive. In this scenario, you experience one or more of the following issues: Users can't open the shared mailbox in Outlook. Jun 25, 2025 · Describes how to troubleshoot issues that trigger Outlook crashes when you use Outlook in a Microsoft 365 environment. 2 days ago · If the shared mailbox is not receiving emails, there are a few potential issues to consider: Mailbox Permissions: Ensure that the users have the correct permissions to access the shared mailbox. 011) and are experiencing an issue with Outlook Web Access (OWA) where PDF files cannot be previewed or downloaded. Jan 28, 2025 · Connection Issues: Network problems or Office 365 service disruptions can hinder access to shared mailboxes. Jan 17, 2024 · If you have access to the shared mailbox in OWA, and if you are trying to add the shared mailbox in New Outlook, right-click the name of the primary mailbox, and then choose "Add a shared folder or mailbox. Dec 9, 2023 · Hi All One of my user is unable to open shared mailbox in new outlook for MAC. 9 efficacious solutions work for all versions of Outlook 2010 - 365 and earlier and will help you quickly fix the "Microsoft Outlook Not Responding" problem. This feature is useful for help and support mailboxes, allowing emails to be sent from "Contoso Jun 25, 2025 · Fixes an issue in which Microsoft 365 users can't directly access a shared mailbox by using Outlook Web App after the service upgrade to Microsoft 365. Oct 7, 2020 · We have multiple Outlook 365 users experiencing freezes/white screen from 10 seconds to 5 minutes or more when using a large shared user mailbox. How can this problem be fixed? And why does this function work in O 2019 but not in O365? Oct 19, 2023 · Hi nip_iv, to search directly the shared mailbox you can locate (click) to a shared mailbox folder (for example Inbox folder of the shared mailbox) in your outlook. Jan 12, 2024 · But when the customers started working with the "new" Outlook, they realised that the results of the search (no matter which search option, etc. The shared mailbox was working fine for the last 4 years until about a week ago. 6 days ago · When Outlook stops responding, freezes at startup, or displays errors when opening your mailbox, the issue might be with the application itself or with the data file where Outlook stores your emails, contacts, calendar entries, and other items. This problem only occurs when opening a shared mailbox in OWA and trying to open a PDF file from an attachment. Roughly every 5 seconds, the window freezes, grays out, and gives a "not responding" message--just as before. Shared Mailbox not opening We've currently got a problems where some shared mailboxes will not open in Outlook web. You can verify this in the Microsoft 365 admin center under Teams & groups > Shared mailboxes. Users can't view free/busy information for the shared mailbox. The Shared mailbox is not working or updating issue can occur due to various reasons. 1 day ago · add and manage shared mailboxes in the new Outlook app, including setup, access verification, and common troubleshooting tips. The mailbox will be visible in the “Shared with me” section of the account. Feb 24, 2025 · Issue Description: We aware of an intermittent issue when attempting to open attachments in OWA Shared Mailboxes. They found missed emails, missed responses, and many more problems, which disrupted their teamwork and communication. The emails to come in, but the email count doesn’t update / doesn’t immediately show in New Outlook. Feb 27, 2025 · Unable to open PDF attachments from shared mailbox with OWA Hi, we are using Exchange 2019 (Build 15. We tried re-adding the mailbox with automapping false and suggested to add… Aug 25, 2020 · We are facing issue with one user while he select Shared mailbox Inbox in outlook his outlook keep crashing other all expect shared mailbox inbox folder other folders are accessible and working fine this issue is strange issue and tired below solution to… This article describes how to troubleshoot Microsoft Outlook when it's used together with Microsoft 365 and: Outlook stops responding (hangs). If you go through all of those steps and Outlook is still crashing or not responding, complete step 4 Jun 25, 2025 · Outlook not responding error or Outlook freezes when you open a file or send mail Applies to: Outlook 2019, Outlook 2016, Outlook 2013, Microsoft Outlook 2010, Outlook 2010 with Business Contact Manager, Outlook for Microsoft 365 Jun 16, 2025 · Microsoft has shared a workaround for a known issue that causes the classic Outlook email client to crash when opening or starting a new message. Describes an issue that prevents you from opening a shared folder in Outlook on the web. . Anyone else experiencing crashes in Outlook due to Exchange Online Shared mailboxes? Here's what we tried so far with limited to no success: Office 365 online repair Rebuilding Outlook profile Run Outlook in Safe Mode Created folder and executable exceptions for Outlook in our Antivirus products Disabled inbound email scanning in Defender Shared folder cleanup. 02. Jun 26, 2025 · Microsoft has fixed a known issue that will cause the classic Outlook email client to crash when opening emails or starting a new message. In new outlook for… Is your shared mailbox not showing in outlook 365? Here are a few solutions you might be looking for. This setup is useful for emails dedicated to company information, support, reception desk, or other functions that multiple people share. Learn how to open a shared mailbox in Outlook. Jun 3, 2016 · Hey all, seems as if I’m not alone being unable to open or access shared mailboxes in Outlook 2016 connected to an Office 365 Exchange. I also removed some old add-ins and an old, inactive account (but Outlook worked no problem with these for a long time). 0. Outlook crashes even though you aren't actively using it. Is this due to the licensing through M365 Family? Does this disable the functionality to add shared mailboxes? The shared mailbox can be added in OWA and on mobile but not in my Outlook client. Here are the steps to fix it. Mar 23, 2023 · Learn how to resolve issues with Outlook hanging, freezing or crashing. Mailbox Storage Limits Classic Outlook users are seeing app crash when opening or creating emails, due to the June 2025 updates. " Enter the shared mailbox account. Occurs only in mailboxes that were migrated from the on-premises environment to Exchange Online. Multiple users can access and send or receive messages to or from one or more shared mailboxes. Then enter your keywords and press Enter. Outlook crashes when you start it. I work in AD and have a problem where most of my users including myself are unable to access a shared mailbox. Jun 25, 2025 · A computer that has slower hardware, a large mailbox, and slow network connection may not be able to open more than five shared folders or mailboxes. OWA is working fine and the user can open the shared mailbox. Then, click on the search bar and on the left the new menu should appear. Read this article to know more. 1544. Has anyone come across this issue and found a Jan 2, 2025 · Adding the shared mailbox to Outlook Once you’ve been granted these permissions, you can add the mailbox to your Navigation Pane in Outlook in the following way; File-> Account Settings-> Account Settings…-> select your Exchange Account-> button Change-> button More Settings…-> tab Advanced-> button Add… Adding a Shared Mailbox to Outlook. Affected users experience difficulties accessing attachments, leading to errors or timeouts. Thanks for any advice. You assign Full Access permissions to one or more users. I have two users who access the same shared mailboxes in Outlook 365, whenever they go to click/move/copy/interact in any way with an email with attachments, the client freezes for a while or just crashes outright. Multiple users have this Jun 30, 2025 · If Outlook has stopped working, is not responding, or freezes or hangs frequently on Windows 11/10, then take a look at this post. Sep 3, 2024 · Hello, I am having an issue with one shared mailbox. However, users need permission to access, search, or send messages on behalf of a shared mailbox, which is usually granted by the administrator. Provides a resolution. You can choose "All mailboxes", "Current folder" or "All Outlook elements". Open and use a shared mailbox in Feb 23, 2025 · I can fully integrate my account with the EXO license but can't add the shared mailbox as seen in my screenshot. Try steps 1 through 3 in order until the issue is cleared. 20078) 64-bit, using the credentials of a user with only a Exchange Kiosk license and then Outlook froze up like you described (after the login credential was accepted). Jul 23, 2025 · Sometimes, users encounter issues when trying to access shared mailboxes in Outlook. If there is a problem with connectivity or the server, error messages may prevent users from interacting with the mailbox. As discussed earlier, this issue may be caused by insufficient access rights. Feb 7, 2024 · So we had a client reach out stating that their shared mailboxes don’t automatically update the emails. Oct 8, 2018 · Methods to Resolve “Shared Mailbox not working in new Outlook” Issue? Some of the reliable solutions to fix this issue are listed below: Fix 1: Validate Permissions: It is always better to start with the basics. Apr 8, 2024 · We have a shared mailbox that is currently only shared between myself and a colleague and is not a frequently used email account, as of yet. 17726. This specific one does not work with new Outlook but works with web and old version. Jun 25, 2025 · You create a shared mailbox directly in Exchange Online. in old outlook for MAC-->Tools--Accounts--Advanced--Select Delegates--Open these additional mailboxes: Added shared mailbox and it is working fine. In this post, you will learn the reasons behind this issue and the solutions to troubleshoot and resolve it. I have several mailboxes and all are working fine except for one. Shared mailboxes let a group of users view and send email, and share a calender, and open a contact list from a common mailbox. Does anyone have the same issues? Feb 19, 2025 · Are your shared mailbox folders not showing up in Outlook 365? Find all missing & invisible shared mailboxes that disappeared from Outlook. Sep 25, 2025 · Office 365 Shared Mailbox Not Showing in Outlook, did this happen with you? Get quick fixes for your disappeared shared mailbox issues. An administrator can grant users permission to send email from the shared mailbox. When clicking on the mailbox the message pops up "You might not have permission to perform this action" I have checked all permissions on Exchange Admin Center and everything seems correct. Make sure that the users are listed as members with the appropriate permissions. Aug 3, 2022 · Describes how to troubleshoot issues that trigger Outlook crashes when you use Outlook in a Microsoft 365 environment. No further progress. If you are not able to May 10, 2022 · Hi there, I am using Outlook 365 and have an issue with opening another mailbox using my profile on laptop and web. ) do not contain the mails of the subfolders of shared mailboxes. We tested this issue on our own 365 tenant and 3 other clients (all have the same issue). When I try to open it with the new Outlook I get…. I was able to test download shared folder and it seems faster, but this option is grey out due to firm policy on best practices. Oct 9, 2025 · In recent updates, many users have reported issues with Shared Mailbox not working in Outlook. Only stores two weeks of emails Nov 7, 2024 · Hello all, We have a issue with user, this user outlook gets freeze when they any mail from inbox from Shared mailbox, and we checked the Shared mailbox in web it's working fine. Anyone know a solution to this? Jun 25, 2025 · Describes a problem that causes Outlook to hang immediately after startup, and a Not Responding message is displayed on the title bar. xmrnt36bt0l5ekgfw5m8n2vmzhhmdhqg2pddaxd8p24anvfn8peg