To reduce the number of items that are stored locally, limit the synchronization window that's used for shared folders. These keys don't clean up older Calendar content that was already downloaded. However, this method can be effective if you're willing to clear offline items and resync your Calendar (instead of bulk deleting old items). If you already have the Calendar in the profile, you have to clear the Offline Items after you set the registry keys and restart Outlook. In Sync Window Settings, adjust the number of months of data that are synced for the primary shared calendars. Use the Turn on shared calendar improvements option for users who have edit permissions to a shared calendar to improve performance.

Rollout of the fix to all users will take few weeks, so, some users may see the fix applied by the end of September. 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 https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ same folder. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't. If you're using an Exchange email account, you can delete the offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook.

If so, wait a short time (usually https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ 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 keeps crashing fix (https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/) may have frozen. There are three steps you can take to try to get Outlook working again. See and manage the tasks in the selected list from this window. Right-click a task for a list of options, or select a task to see and manage its details. Shows contacts or contact lists depending on what you selected in the left pane.

Get Help has troubleshooters for classic Outlook for Windows you can run for many common scenarios, https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ such as Outlook startup or profile setup problems. These often help resolve issues without the need to contact support. Get Help has troubleshooters for Microsoft 365 you can run for many common scenarios. If a troubleshooter is available for your issue, select Start to run that troubleshooter. Microsoft has its own tool for automatically scanning and correcting Office when things go awry. You can read about it and then run the Microsoft Support and Recovery Assistant to see if that helps.

Use the Microsoft 365 setup troubleshooter to install Microsoft 365, Office 2021, Office 2019, or Office 2016 on your Windows PC. This option could be useful if you constantly have to wait for Outlook to rebuild its data file when you restart. There are multiple ways for you to send and receive email, and multiple versions of Outlook available. If the images in these topics don't match what you see on your screen, you might be using a different version of Outlook. If you can't receive new email messages, there are several troubleshooting steps you can take. If you've successfully sent and received email from classic Outlook before, and now Outlook repeatedly asks you to reenter your password, one of two things may have happened.

If a troubleshooter is available for your issue, select Start to run that troubleshooter. Not something you want to take on lightly, but sometimes you have to. Be aware that you may need your product key if you received one. You can read how to fix your Outlook problem on the internet, but sometimes the suggestions don’t work for your specific case.

There might also be a visual alert that a message is unread, has an attachment, or is flagged. In the Search box, type the name or email address of a person or a keyword you want to search for, and press Enter or select . This is a lightweight app designed to handle multiple accounts and fairly moderate email use. After you run any troubleshooter, Get Help provides details on any findings and suggestions for possible remedies. If one of these resolves your problem, close the app and continue working.

We have multiple tools to help you automatically diagnose an issue, troubleshoot, and fix problems with Outlook. TrustedTech is dedicated to being a reliable resource for all software and technology support needs. Our relationship to the Microsoft Partner Network allows us to provide competitive pricing and authentic software and support, all with a much-needed human element. Use the MIcrosoft 365 inventory scan troubleshooter to generate either a normal or full scan report of your computer and installed Microsoft 365 applications. Use the Microsoft 365 sign-in troubleshooter to help resolve sign-in issues encountered with Microsoft 365.

This article helps when users cannot add a team https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ to a group or cannot add a standalone team.On the... The Support and Recovery Assistant app can help you identify and fix several issues for the following apps and services. This option could be useful if you constantly have to wait for Outlook to rebuild its data file when you restart. To get support in Outlook.com, click here or select Help on the menu bar and enter your query. If the self-help doesn't solve your problem, scroll down to Still need help?