However, you might experience decreased performance as the number of items approaches 10,000 calendar items, 10,000 folders, or 100,000 mail items per folder. Large numbers of recurring meetings or long-lived recurring meetings can also have an exaggerated effect on performance. One-time meetings have a relatively small effect, and long-lived, recurring meetings have a greater effect. A change that’s made in an instance of a recurring meeting creates exceptions that are stored in the recurring meeting series. Every change to the meeting attributes, such as the subject, body, location, or time, creates a corresponding exception. Eventually, these exceptions inflate the size of the recurring meeting and impose https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html a greater performance cost.
Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur. The settings in the Send/Receive Group windows let you customize the synchronization rate of the new group. The software can be deployed in virtual, hosted cloud, on-premises, or hybrid network environments. The company sells its software and services directly and through a network of global channel partners. Before using this tool, we recommend making a backup copy of your PST file in case any errors or file corruptions occur to the original file.
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For more information about when builds are available for their respective channels, go to Update history for Microsoft 365. We’re investigating the issue and will update this page when a fix is available. MAPI does not validate that a provider’s DLL that it is requested to load is registered correctly in MapiSVC.inf or even that it comes from the local machine. This can be exploited by creating a file together with an OLE object in such a way to cause MAPI to load a DLL from a network share when the OLE object is activated. If you’re using Outlook 2010, Outlook 2013 or Outlook 2016, uninstall and re-install iCloud to resolve this issue.
As a result it is imperative that Outlook is installed, and kept up-to-date, on all required devices. Devices without an up-to-date Outlook client may result in an impaired digital experience and should be investigated. Devices with Outlook not installed should also be investigated to ensure that this is not an oversight. The folder may have been deleted or the server where the folder is stored may be unavailable. You don’t have appropriate permission to perform this operation. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure.
You can learn https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html more about the new and classic tasks in Outlook.com by going to Use To Do App to manage tasks in Outlook. Contact someone directly by selecting Start chat or Send email. If you decide you don’t want the calendar you created, right-click the calendar and select Remove. Each message also has a mini toolbar when you open the message in a new window. For each message, you can delete it, mark it as unread, flag the message, or pin it to keep it at the top of your folder.
To determine the cause of the performance issues, start the Assistant, and run the Outlook Diagnostic in the Advanced Diagnostics section. Sometimes, your PST files can develop errors or https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html data inconsistencies, resulting in unexpected behavior in Outlook. When you suspect that there’s an issue with the integrity of your PST file, you can run Scanpst.exe to repair your PST files.
When Microsoft Outlook is installed on your computer, numerous files, registry entries and configurations are set up to make sure the program runs smoothly. If any of these components are missing or corrupted during installation, Outlook may fail to open or could crash unexpectedly. You can determine if it’s corrupted by creating a https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html new profile and changing which profile is used when Outlook starts.
You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile. If you’re using an outdated version of Outlook, it can result in slower performance due to a lack of necessary updates and improvements. First, let’s look at https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html the most common reasons the Outlook app is so slow to open and how Clean Email can remedy each one.
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.