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Add How to troubleshoot performance issues in Outlook

Holly McCormack 2025-11-04 19:31:24 +08:00
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Start classic Outlook in safe modeIn Windows 10, click Start.Type Outlook /safe, in the Search programs and files and then click OK.Close and re-open Outlook.If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem.
These issues might occur if a mailbox contains lots of folders or there are lots of items in any one folder. There's no hard limit to how many folders a mailbox can contain or how many items a folder can contain. 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.
ProcedureExit Outlook.Open a Run dialog box. ...Type Outlook /safe, and then click OK.If the issue is fixed, click Options on the File menu, and then click Add-Ins.Select COM Add-ins, and then click Go.Click to clear all the check boxes in the list, and then click OK.Restart Outlook.Jun 25, 2025
Some add-ins (or even only one) may be interfering with Outlook, thereby preventing the app from opening. Here's how to disable add-ins to check if they're the problem. If you have logged in to your @live.com email address in the last 12 months but don't remember the password, you can try the Microsoft Recovery Form.
Microsoft created a support and recovery assistant. This program is designed to run some tests, provide a diagnostic, and help you fix common issues with your Outlook account. If calling people on the phone is not your preferred option, you can contact Outlook’s customer service via a live chat. Outlook Safe Mode support refers to the resources and assistance Microsoft provides for users who encounter issues while using Outlook in Safe Mode. Overall, Outlook webmail support provides a email recovery and repair comprehensive system to help you troubleshoot problems and effectively use the web-based version of Outlook for managing your email and schedule.
Currently, you can't use Outlook on Windows to edit calendars that are shared with your Outlook.com account, even if you've reconnected your Outlook.com account to Outlook. We're working to make it possible to edit shared calendars in Outlook 2016 for Windows. If you manually type in the secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account. You can use email recovery and repair 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. In some cases, an Outlook messaging profile may be misconfigured.
For password issues you must call or visit the Help Desk in person. email recovery and repair You may see one of the following errors in a pop-up message on your screen. Step 1 - For both Windows and MacOS users, Microsoft Outlook has the ability to recover deleted items Outlook Desktop App. If you can't receive new email messages, there are several troubleshooting steps you can take. However, if you want to change your password with your email provider, you'll need to visit their website or help desk, or contact your email administrator. For example, if you have a Yahoo! account, you first have to change your password at Yahoo.com.
– Use the search feature to find email recovery and repair specific help articles or guidance based on your issue or query. Logging into Outlook seamlessly integrates with other Microsoft Office applications and services, providing a unified experience for managing your personal and professional tasks. Microsoft Outlook support has support options for business and enterprise.
After finding the errors, their next task is to resolve them. For many types of email accounts, classic Outlook stores your messages in a Personal Folders File (.pst file). For more information, see Repair your Outlook personal folders file (.pst). If you are having sync issues, [email recovery and repair](https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/) you can force a manual sync by selecting the Sync button via the View tab on the Ribbon.
Once you've changed your password with your email provider, you can update the password in Outlook. See Change or update your email password for more information. 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 you're trying to set up an iCloud account, follow the email recovery and repair steps in Add or manage an iCloud email account in Outlook. For Gmail accounts, see Add a Gmail account to Outlook. This option could be useful if you constantly have to wait for Outlook to rebuild its data file when you restart.