Reduce the number of recipients for a single email to less than 300. We have multiple tools to help you automatically diagnose an issue, troubleshoot, and fix problems with Outlook. We love reading your suggestions on new features and feedback about how you use our products!

Below, we’ll guide you through a series of solutions, from simple, quick fixes to more in-depth repairs, to help you get Outlook up and running again. 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.

SCANPST.EXE, provided by Microsoft, is well-suited for addressing minor issues in PST files and is a helpful free tool for basic repairs. In contrast, third-party tools like the SysCurve PST Repair Tool are equipped to handle more complex and severely corrupted PST files. Yes, it's safe to use reputable third-party tools like the SysCurve Outlook PST Repair Tool for repairing corrupt PST files. However, it's essential to always back up your PST file before using any third-party repair tool as a precautionary measure. To repair PST file, Microsoft provides the Inbox Repair Tool or SCANPST.EXE within the Outlook program.

There are a number of reasons this issue arises, which makes it even more infuriating. It could be an issue with a setting on the account, or it could be something external that is blocking normal functions in Outlook. The AppData folder hosts a lot of files, including bookmarks and cached pages.

Whether it’s creating a new outlook profile or setting up your primary email, we’ve got you covered. Sometimes a Windows update or app update—meant to fix things—ends up causing the problem. Especially if you’re using a different version of Windows, this can break compatibility with Microsoft Outlook or Outlook configuration files. If Outlook still misbehaves, your antivirus might be resolving Outlook not responding the culprit.

If you can't start the Inbox Repair tool automatically or manually, you may try to repair your Office application. When you are online, Outlook synchronizes the data in the OST file with the Exchange Server, ensuring that you have the most up-to-date information. This synchronization occurs automatically and transparently, allowing you to work seamlessly between online and offline environments.

EdbMails resolving Outlook not responding allows you to recover data from corrupted, damaged, or inaccessible OST files and supports direct import to Office 365 and live Exchange environments. It works seamlessly across all Windows and Outlook versions, preserving the original folder hierarchy and formatting throughout the recovery and migration process. ScanPST.exe is a useful tool that can help you repair and restore corrupt or damaged PST file.

When this registry key is set, Outlook will use its own built-in search engine. The built-in search will display the message below to indicate it is not using the Windows Search service. The issues documented in this section have been reported after installing the recent updates listed below.

You may notice that All, Unread , Mentioned and other sort and filtering options, such as By date, and Newest are missing in Outlook above your email list. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. This issue affects all Outlook versions on Windows 7, Windows 8, Windows 10. If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be resolving Outlook not responding to blame or you may need to update Outlook.

This slows down productivity and quite frankly is just a total nuisance. If you're entering a password you know is correct and getting a message that says “incorrect password,” then you'll want to read this page. This process syncs your Outlook calendar to your Google calendar, as long as you keep resolving Outlook not responding up with your subscriptions. However, in most cases, the changes will reflect almost instantly.

If you are using Outlook on a PC, you can check to see what is currently permitted by your computer or try to reset the Credential Manager and remove any old passwords. The Credential Manager is where Windows stores passwords and login information resolving Outlook not responding on your computer. It acts as a vault with specific settings and permissions you can adjust. Check your settings to see if you've got the “always prompt for password” feature enabled.

It can automatically diagnose issues, troubleshoot, and fix problems with Outlook. A more general version that can also fix Office, Microsoft 365, and other Outlook problems can be found here. Add a contact to your Favorites by selecting a contact in the list, and then selecting Add to favorites. Keep track of appointments, meetings, or any other event from anywhere. Add, edit, or delete events using daily, weekly, or monthly views. For more information about working with calendars in Outlook.com, go to Using the calendar in Outlook.com.

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