Outlook | Windows | New Outlook for Windows | For business
Using New Outlook on Windows for professional communication and productivity
Having a similar issue. The repair and reset did not help. Now I cannot open the application.
Unable to attach files using Outlook.
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Andrew Butler
0
Reputation points
When I try to attach any file using the standard Outlook app on the PC, the whole app hangs and I have to cancel. This has developed suddenly, and I have no idea how to resolve it. Rebooting the PC doesn't help. This is the current latest version of Outlook, running on Microsoft 365, on a nearly new Asus Windows 11 computer.
Outlook | Windows | New Outlook for Windows | For business
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Holly Arthur 0 Reputation points2026-11-12T20:04:05.2033333+00:00 -
Stefan Blom 357.7K Reputation points MVP Volunteer Moderator2026-11-13T09:59:29.7333333+00:00 Please start your own thread so that your question gets more attention. Use the Ask a question link. Good luck.
The current thread is old and it will be closed.
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Aetherin 3,930 Reputation points Independent Advisor2026-09-25T15:15:34.5733333+00:00 Hi @Andrew Butler,
To help narrow down the cause, could you please check a couple of things?
- Does it freeze before the file picker opens, or after selecting the file?
- Are you able to attach the same file when using Outlook on the web?
- Does dragging the file directly from File Explorer into the message produce the same result, or does it only happen when using the Attach file button?
In the meantime, as a workaround, you may use Outlook on the web, drag and drop the file into the message, or upload it to OneDrive and send it as a sharing link.
If the web version works normally, the issue may be specific to the local Outlook app. In that case, please try repairing the app: Windows Settings > Apps > Installed apps > Outlook (new) > Advanced options > Repair.
If Repair does not help, try Reset, then sign in again with your account and test attaching a file once more.
Please give these steps a try and provide the results, along with any additional details you can share. I'd be happy to take a closer look and help investigate further.
Thank you for your patience.
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Aetherin 3,930 Reputation points Independent Advisor
2026-09-27T08:43:43.1233333+00:00 Hi @Andrew Butler,
Have you had a chance to check the replies provided? Any update would be appreciated.