This article describes how to troubleshoot Microsoft Outlook when it's used together with Microsoft 365 and: Outlook stops responding (hangs). Outlook crashes even though you aren't actively using it. Outlook crashes when you start it. Try steps 1 through 3 in order until the issue is cleared.

Microsoft Update. Use Microsoft Update to automatically download and install the update. Download Center. This update is also available for manual download and installation from the Microsoft Download Center. Download update 5001998 for 32-bit version of Outlook 2016.

This security update resolves a Microsoft Excel remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2022-26901. Note: To apply this security update, you must have the release version of Microsoft Office 2016 installed on the computer.

Refunds for digital games include Microsoft Store digital game offers, Xbox apps (excluding movies and TV apps), digital gaming bundle offers, digital game durable content, and some digital game consumable content, whether made available through the Xbox console, on your PC, or on your mobile device.

This update will make sure that your device has the highest probability of successfully installing new updates with the most robust and reliable update stack available. This Update Stack Package is limited to a select set of update related system files.

Make sure App updates is turned On. Note: Some app publishers manage their own updates through their app. Learn how to turn on automatic app updates and how to manually check for updates in Microsoft Store.

Summary. This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2018-8248.

Description: [PowerShell] An internal server error occurred. The unhandled exception was: Microsoft.Exchange.Collections.TimeoutCache.DuplicateKeyException: Cannot add a duplicate key. Use Insert instead. at Microsoft.Exchange.Security.Authentication.FederatedAuthService.CacheReader.AddEntry (String userKey, Int32 userPolicy, ConfigWrapper config)

Excel gives you the ability to protect your work, whether it’s to prevent someone from opening a workbook without a password, granting Read-Only access to a workbook, or even just protecting a worksheet so you don’t inadvertently delete any formulas.

Open Outlook. Enter your Microsoft 365 email address, and then select Connect. Enter any additional email addresses that you want to use and then select Next. If prompted, enter a password, and then select Sign in. After all your accounts have been added, choose if you want to set up Outlook mobile or wait until later. Select Done.