Outlook crashes when sending emails after Microsoft Update

The fix worked for me.

The reporting and detailed descriptions of the exact issue helped identify what at first appeared to be a preexisting problem with an existing solution. All the contributions clearly helped to show this was a new bug, which prompted a fix. Many thanks to all on this forum, and to those who generated the fix!

Hi all,

The build with the fix just released Version 2311 Build 17029.20068, Outlook Desktop crashes sending an email from Outlook.com accounts - Microsoft Support. To install the fixed build, click File, Office Account, Update Options, Update Now.

I suspect what has happened is that when 'new outlook' was foisted on users, it overwrote one or more system files used by 'old outlook'. 'old outlook' won't work with the new files, which is why it crashes when attempting to send an email.
Either we wait and hope Microsoft addresses this problem; or we do as you have, revert back to ‘old outlook’, and turn off automatic updates!

Same issue here.

Outlook application has 2 hotmail.com (outlook.com) email accounts. In the last day I can no longer send emails, the application simply closes and (sometimes) restarts.

Created a new mail profile with a single hotmail.com account. Problem persists.

Ran online repair of Office suite. Problem persists.

Incoming email is fine.

Only affects sending/replying and also when I switch accounts in the "from" field when composing an email.

Sending and receiving from mobile app or outlook.com website is working fine.

There are at least 3 reports on this forum in the last day of the same issue.

Outlook 2311 (Build 17029.20028)

Windows 10 22H2 (OS Build 19045.3693)

Hi Mike,

Thanks for contacting us and sorry for the inconveniences,

One of the most likely causes of Outlook crashing is a conflict with an add-in that is incompatible with the latest version of Outlook. To check if this is the case, you can try to run Outlook in safe mode, which disables all add-ins, and see if the problem persists. To do this, follow these steps:

• Exit Outlook.
• Press the Windows logo key + R to open a Run dialog box.
• Enter Outlook /safe, choose a profile if prompted, and then select OK.
• Try to send an email and see if Outlook crashes or not.

If Outlook doesn't crash in safe mode, it means that one or more of your add-ins are causing the problem. You can then try to disable or update the problematic add-ins by following these steps:

• In Outlook, click the File tab and then head to Options.
• In the Outlook Options window, navigate to the Add-Ins tab.
• At the bottom of the window, select COM Add-ins and then select Go.
• Clear the check boxes for any add-ins that you suspect are causing the issue, and then select OK.
• Restart Outlook and try to send an email again.
• If the issue doesn't recur, you can try to enable the add-ins one by one until you find the one that causes the problem. You can then either uninstall, update, or disable that add-in permanently.

Another possible cause of Outlook crashing is a corrupted or outdated Office installation. To fix this, you can try to repair or update your Office programs by following these steps:

• Type Control Panel in the search box at the bottom of the Windows screen.
• Select Uninstall a program from the Programs group.
• In the list of installed programs, right-click the entry for your Microsoft 365 installation and then select Change > Online Repair.
• Follow the instructions on the screen to complete the repair process.
• Restart your computer and check if Outlook works properly.
• If not, you can also try to install the latest Windows and Office updates by going to Settings > Update & Security > Windows Update and selecting Check for updates.

A third possible cause of Outlook crashing is a damaged or misconfigured Outlook profile. To fix this, you can try to create a new Outlook profile and see if that resolves the issue. To do this, follow these steps:

• Type Control Panel in the search box at the bottom of the Windows screen.
• Select User Accounts > Mail.
• Select Show Profiles.
• Select the profile that you want to remove, and then select Remove. Note: Removing a profile also removes any associated data files. If you're not sure whether the data files are backed up or stored on a server, do not remove the profile. Instead, skip to the next step.
• Select Add.
• Type a name for the new profile in the Profile Name box.
• Enter the user name and the primary SMTP address. Then select Next.
• You might see the message Allow this website to configure alias@domain server settings? Select the Don't ask me about this website again checkbox, and then select Allow.
• When prompted, enter your sign in credentials, and then select OK.
• When Setup is finished, select Finish.

If none of the above solutions work, you can also try to run the Microsoft Support and Recovery Assistant, which is a tool that can diagnose and fix common Outlook issues. To do this, follow these steps:

• Download and install the Microsoft Support and Recovery Assistant.
• Run the tool and select Outlook from the list of apps.
• Follow the instructions on the screen to identify and resolve your Outlook problem.

I hope this helps!

Regards, Sola/alias@domain