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Opened Sep 20, 2025 by Marcus Timmerman@marcustimmerma
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Outlook crashes or stops responding when used with Office 365

To effortlessly change your settings so that your inbox looks the way you want it to, see Personalize your new Mail experience in Outlook.com. New features like Files and attachment previews let you see your pictures and files without leaving your inbox. Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other Outlook Fix Blog mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running.

Creating a Outlook Fix Blog new Outlook profile may resolve some performance issues. Items moved into new folders will still be located when searching a mailbox. Outlook forwards meeting invitations to other attendees without anyone actually sending an update or forwarding an invite.

Third-party add-ins are helpful… until they’re not. Outdated or conflicting ones can mess with Outlook’s core performance, causing unexpected slowdowns or outright failure to launch. Create your account and connect with a world of communities.

For more information about working with calendars in Outlook.com, go to Using the calendar in Outlook.com. Select More to see additional actions—for example, an option to print a message. If you want to learn about printing, see Print attachments received in email messages. You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below.

Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running. If so, wait a short time (usually two or three minutes) to see if Outlook starts working again. If you can't choose any of the menu options, type inside an email message, calendar event, or contact, Outlook may have Outlook Fix Blog frozen.

Or, if the error lasted in Safe mode also, moving to the next solution is a better option. Before trying any fixes for the mentioned Outlook error, try one of the quickest hacks. If not, move ahead to other solutions to troubleshoot Outlook error Something is wrong with your data files. Users now should be mindful of the common causes why users need to fix Outlook data files (PST).

Learn how to get more out of your connection with Outlook.com. We've streamlined search to make it easier than ever to find what you're looking for. The new Outlook Attachment Preview feature lets you see your pictures and files without leaving your inbox.

The Scanost.exe tool is no longer available starting in Outlook 2010. We now recommend that you delete your offline Outlook Data File (.ost) and that you let Outlook redownload the information from the server that is running Exchange Server. Rohan Wiese is a Technical Content Writer at Aryson Technologies, specializing in databases, e-mail recovery, and e-mail migration solutions. To resolve this issue, delete your .ost file and that you let Outlook redownload the information from the server that is running Microsoft Exchange Server.

Hopefully, one of these solutions worked for you, and Outlook is now stable and operating normally. Corrupt data files (OST or PST) can also cause this Outlook crashing issue. However, rebuilding the data file can resolve corruption issues. I have a user who's outlook crashes and restarts every 30 minutes. It is so precise that you can set your watch to it.

If you decide you don't want the calendar you created, right-click the calendar and select Remove. Under Calendars, My calendar is the default selection and displays the calendar in Month view. You can move forward or backward through Outlook Fix Blog calendar months using the arrows above the calendar. To show or hide the Folders list, select Show or Hide the navigation pane. Calendar events can be used for your own personal event, or you can invite others to create an in-person or Teams meeting.

Most of these crashes come down to one thing – problematic data files. PSTs and OSTs act like Outlook’s memory banks. When they get too large, go corrupt, or are poorly configured, Outlook Fix Blog things start to break. This should resolve the issue of ‘Outlook keeps crashing’.

If you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't.

You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below.

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Reference: marcustimmerma/official-fix-outlook-guide2011#5