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Outlook (New) Beginning to Fail Across Our Entire Organization

Alex Rourke 146 Reputation points
2025-12-12T16:03:45.93+00:00

I manage a company and we're noticing Outlook (New) beginning to fail across our entire organization over the past week. For some users, this is manifesting itself as Outlook not being able to start up at all, for others, it is freezing constantly and causing Windows Explorer to freeze as well.

Clearing the local cache solves the problem for users for whom Outlook does not launch at all, but this a temporary solution - it ends up freezing or breaking again.

This is happening on several computers with different hardware and software profiles. Some of these computers were provisioned yesterday and have little else on them other than a fresh installation of Windows and Office.

I know the normal routine here, "Provide feedback in the app! Reset Windows!" Those are bad solutions to what is clearly a bug in new Outlook. I'm posting this here hoping (praying, really) that Microsoft gets their development and QA process together.

Microsoft - AI is not a panacea and cannot replace your QA and testing process for updates. Just because it saves you money doesn't mean it is good for users. You are forcing our company to evaluate other solutions because we can no longer trust you to release quality updates.

Outlook | Windows | New Outlook for Windows | For business
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  1. Killian-N 6,910 Reputation points Microsoft External Staff Moderator
    2025-12-12T17:01:13.9933333+00:00

    Hi @Alex Rourke,

    Thank you for posting your question in the Microsoft Q&A forum.

    I’m sorry you and your team are running into this. When the new Outlook for Windows starts to fail across multiple machines (including fresh builds), that’s typically beyond what end‑user cache reset can fix and should be investigated by Microsoft Support on the tenant side. Getting a tenant‑level support ticket opened ensures the right telemetry and engineering path is engaged, that's why I recommend opening a Support ticket directly to Microsoft Support.

    You can create a support ticket by sign in to the Microsoft 365 Admin Center following steps from this link: Get support - Microsoft 365 admin | Microsoft Learn to raise a support ticket from admin center or calling the phone support to contact Microsoft Support: Customer service phone numbers - Microsoft Support.

    If you are not an admin, you can contact your admin to contact Microsoft support. You can look for the way to find your admin through this link: How do I find my Microsoft 365 admin? - Microsoft Support.

    As community moderators, we kindly ask for your understanding that our access to internal development details is limited. Our primary role is to guide users toward the appropriate resources and support channels. While we may not have influence product design decisions and have limited access to internal development details, we’ll continue doing our best to support you within the scope of our responsibilities.

    I hope the information provided proves useful.

    Thank you for your patience and understanding throughout this process. Please reach out again if you need further assistance.

    Wish you a great day.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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