The built-in search will display the message below Online Outlook Email Repair Utility 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. We're investigating the issues and will update this page when a fix is available. In the meantime, please use the workarounds suggested for each issue. If you typically use an Outlook.com account for email, this issue can occur if there are multiple aliases on the account and the 3rd party email address is the primary alias.

Troubleshooting Co-Authoring and Collaboration Errors

• This post also mentions the downgrade to an earlier Microsoft 365 build, which was previously described as a workaround.
• Sometimes, issues can be caused due to a corrupt Outlook OST file.
• Outlook slows down, crashes randomly, or fails to load entirely.
• The loading of unregistered MAPI services has been disabled by default to make Outlook more secure.
• As active members in the IT community, we work to support our clients’ businesses and provide them with peace of mind.
• When this registry key is set, Outlook will use its own built-in search engine.

Check your antivirus software’s settings and ensuring Outlook is listed as a trusted application. The colleagues at Bleeping Computer noticed this update and addressed it in this post. This post also mentions the downgrade to an earlier Microsoft 365 build, which was previously described as a workaround.

Get Expert Help from TrustedTech

Microsoft had confirmed the issue for Windows Server 2016 and 2019 and recommended a downgrade. With apps syncing across devices and cloud services, sync issues are among the most frequently reported M365 problems. These can include missing files, ghost icons, or documents that do not update in real-time. You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile.

Outlook Known issues in April 2023 updates

Microsoft Outlook is one of the best-known business-class email clients from Microsoft. It is a feature-rich application that allows users to manage multiple email accounts, calendars, contacts, and tasks. Outlook also offers several advanced features, like email tracking, read receipts, and email templates, making it a powerful tool for managing email-based workflows.

Outlook Known Issues in November 2021 updates

Corrupted or badly set-up Outlook profiles can often reset cached Exchange mode cause start-up problems. The app might refuse to launch or crash at the splash screen. Outlook slows down, crashes randomly, or fails to load entirely.

Outlook Known issues in October 2022 updates

We're working to make it possible to edit shared calendars in Outlook 2016 for Windows. Not Implemented Error mostly appears in Outlook 2010, 2013, 2016, 2019 and latest Microsoft 365 version. Boost your SMB’s security and compliance with Microsoft 365 Business Premium. Discover Defender and Purview add-ons for enterprise-grade protection at SMB-friendly pricing. In these cases, direct escalation to Microsoft or working with a Microsoft CSP partner, such as inbox repair tool alternative TrustedTech, can expedite resolution and minimize downtime. Our licensing engineers can help triage complex problems and ensure you're on the right support path.