We're investigating the issue and will update this page when a fix is available. If you're using Outlook 2010, Outlook 2013 or Outlook 2016, uninstall and re-install iCloud to resolve this issue. This issue affects all Outlook versions on Windows 7, Windows 8, Windows 10.
Blocking someone doesn't stop their email from coming to your mailbox, but it does automatically move the message to your Junk Email folder where you can review it (in case it was blocked in error). This fix will also lead to a reduction in the total number of contacts on your contact list. We will ensure that all information is retained and only contacts with matching information in all fields will be cleaned up.
Add a contact to your Favorites by selecting a contact in the list, and then selecting Add to favorites. When you add someone as a favorite in People, they'll also show up under Favorites in Mail, and the other way around, provided that the contact has an email address. There might also be a visual alert that a message is unread, has an attachment, or is flagged. This is a lightweight app designed to handle multiple accounts and fairly moderate email use. You can create a new Outlook Data File and drag the items in the Lost and Found folder into the new data file.
It gets better https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html because you also resolve all the Outlook opening issues. If you are trapped in a similar situation that my Outlook is not opening, you may feel disturbed about the problem. In the following post, you will find out solutions for the common Outlook not opening problems bonus tips to prevent the problem from happening again. Restarting your device clears temporary files and can fix minor software conflicts. Should you decide to remove a profile, back up the data files first.
The easiest way to let the indexing finish is to leave Outlook running overnight.Additionally, you can https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html reduce performance issues by running Outlook in Cached Exchange Mode. In this mode, Windows Search or WDS searches the local copy of the mailbox instead of the mailbox content on the server. Adjusting Outlook's Send/Receive schedule can often improve performance. If your send/receive schedule is set to check less-frequently, say, every 30 minutes, try changing it to send/receive every 3 minutes.
Add-ins are extensions that you can install to enhance Outlook’s functionality and unlock additional features, like CRM integration. But these add-ins can sometimes result in compatibility issues, especially if they’re not up-to-date or poorly coded. A conflicting add-in might cause Outlook to freeze, crash, or not open at all.
Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. You can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors. Are you having trouble starting Outlook or receiving "Cannot start Microsoft Outlook. Cannot open the Outlook window" error messages? We can fix the problem for you, or you can use the troubleshooting steps we're providing below to help resolve these startup issues.
You can limit the synchronization window that’s used for calendar folders to reduce the number of items that are stored locally in your calendar folders. Use the Turn on shared calendar improvements option for users who have edit permissions to a shared calendar to improve performance. When you enable this option, calendar actions are sent directly to the server instead of having to be synchronized from local storage. I even reduced mailboxes sizes and that didn't help, I setup a new user (albeit existing PC but new windows profile), and he is having the same issues. If the mailboxes open automatically after removing them and restarting Outlook, they may be auto mapped. This setting can be changed by an Exchange admin by submitting a https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html request via Jira and including the usernames of the client and the usernames of the mailboxes that need to be removed.
Microsoft periodically releases Windows updates and service packs. Having the latest updates and service packs can help improve your computer’s overall performance as well as Outlook’s performance. Items moved into new folders will still be located when searching a mailbox. You can use Microsoft Support and Recovery Assistant to diagnose both Calendar and Mail issues that affect Outlook. To download and install the Assistant, see About Microsoft Support and Recovery Assistant.
Select a contact or contact list to view details in the contact card on the https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html right. You can also select multiple contacts—for example, to send an email to the selected contacts. New features like Files and attachment previews let you see your pictures and files without leaving your inbox.
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. Then, each item in your calendar folder is checked for known problems that can cause unexpected behavior, such as meetings that seem to be missing. After you've selected a task, you can use the details pane to do things like add more information, add steps, or mark as important.
Blocking someone doesn't stop their email from coming to your mailbox, but it does automatically move the message to your Junk Email folder where you can review it (in case it was blocked in error). This fix will also lead to a reduction in the total number of contacts on your contact list. We will ensure that all information is retained and only contacts with matching information in all fields will be cleaned up.
Add a contact to your Favorites by selecting a contact in the list, and then selecting Add to favorites. When you add someone as a favorite in People, they'll also show up under Favorites in Mail, and the other way around, provided that the contact has an email address. There might also be a visual alert that a message is unread, has an attachment, or is flagged. This is a lightweight app designed to handle multiple accounts and fairly moderate email use. You can create a new Outlook Data File and drag the items in the Lost and Found folder into the new data file.
It gets better https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html because you also resolve all the Outlook opening issues. If you are trapped in a similar situation that my Outlook is not opening, you may feel disturbed about the problem. In the following post, you will find out solutions for the common Outlook not opening problems bonus tips to prevent the problem from happening again. Restarting your device clears temporary files and can fix minor software conflicts. Should you decide to remove a profile, back up the data files first.
The easiest way to let the indexing finish is to leave Outlook running overnight.Additionally, you can https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html reduce performance issues by running Outlook in Cached Exchange Mode. In this mode, Windows Search or WDS searches the local copy of the mailbox instead of the mailbox content on the server. Adjusting Outlook's Send/Receive schedule can often improve performance. If your send/receive schedule is set to check less-frequently, say, every 30 minutes, try changing it to send/receive every 3 minutes.
Add-ins are extensions that you can install to enhance Outlook’s functionality and unlock additional features, like CRM integration. But these add-ins can sometimes result in compatibility issues, especially if they’re not up-to-date or poorly coded. A conflicting add-in might cause Outlook to freeze, crash, or not open at all.
Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. You can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors. Are you having trouble starting Outlook or receiving "Cannot start Microsoft Outlook. Cannot open the Outlook window" error messages? We can fix the problem for you, or you can use the troubleshooting steps we're providing below to help resolve these startup issues.
You can limit the synchronization window that’s used for calendar folders to reduce the number of items that are stored locally in your calendar folders. Use the Turn on shared calendar improvements option for users who have edit permissions to a shared calendar to improve performance. When you enable this option, calendar actions are sent directly to the server instead of having to be synchronized from local storage. I even reduced mailboxes sizes and that didn't help, I setup a new user (albeit existing PC but new windows profile), and he is having the same issues. If the mailboxes open automatically after removing them and restarting Outlook, they may be auto mapped. This setting can be changed by an Exchange admin by submitting a https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html request via Jira and including the usernames of the client and the usernames of the mailboxes that need to be removed.
Microsoft periodically releases Windows updates and service packs. Having the latest updates and service packs can help improve your computer’s overall performance as well as Outlook’s performance. Items moved into new folders will still be located when searching a mailbox. You can use Microsoft Support and Recovery Assistant to diagnose both Calendar and Mail issues that affect Outlook. To download and install the Assistant, see About Microsoft Support and Recovery Assistant.
Select a contact or contact list to view details in the contact card on the https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html right. You can also select multiple contacts—for example, to send an email to the selected contacts. New features like Files and attachment previews let you see your pictures and files without leaving your inbox.
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. Then, each item in your calendar folder is checked for known problems that can cause unexpected behavior, such as meetings that seem to be missing. After you've selected a task, you can use the details pane to do things like add more information, add steps, or mark as important.