How to fix Outlook connection problems on Windows for Microsoft 365 accounts

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You may notice that All, Unread , Mentioned and other sort and filtering options, such as By date, and Newest are missing in Outlook above your email list.



Fix Outlook and Office 365 Errors 2025

Every click on Send/Receive in Outlook appears Not Implemented Error in Outlook? If yes, then this guide will solve all related errors. Sometimes, issues can be caused due to a corrupt Outlook OST file. To repair corrupt OST file, you can use the built-in ScanPST.exe tool provided by FixTechGuide support for Office 365 Microsoft. Alternatively, you can delete or rename the existing corrupt OST file and rebuild the OST file. Microsoft 365 is a robust platform, but when problems arise, fast resolution is key to productivity.

Troubleshooting Co-Authoring and Collaboration Errors



  • Select the corrupted PST or OST using the file picker.
  • This occurs because custom form script is now disabled by default.
  • When they get too large, go corrupt, or are poorly configured, things start to break.
  • Let’s look at what causes Outlook to crash, how you can fix it, and a smarter tool that takes a lot of the stress off your plate.
  • The issues documented in this section have been reported after installing the recent updates listed below.
  • We go above and beyond the average software reseller because we built our business on trust.
  • Your antivirus software can also cause issues with Outlook connectivity.
  • Microsoft Outlook is one of the best-known business-class email clients from Microsoft.


TrustedTech is a Microsoft CSP Direct Bill Partner with all six Solutions Partner designations and decades of expertise in licensing, support, and cloud infrastructure. If you're looking for smarter ways to manage, secure, or optimize your Microsoft 365 (M365) environment, our U.S.-based team is here to help. In addition, you can export directly into Office 365 mailboxes after recovery with no middle step required.

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Fix Outlook and Office 365 Errors 2025

This tool has helped IT teams across healthcare, finance, education amongst many others. Whether it’s restoring email from encrypted backups or recovering badly broken PSTs, Stellar gets the job done with minimal fuss. You don't have permission to create an entry in this folder. Right-click the folder, and then click Properties to check your permissions for the folder. See the folder owner or your administrator to change your permissions. 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.



Outlook Known issues in April 2023 updates



Fix Outlook and Office 365 Errors 2025

When built-in tools fall short, professional solutions pick up the slack. Using Cached Exchange Mode in complex environments can lead to painful sync delays. If a user has a large mailbox or lots of folder nesting, syncing might lag or even crash. Let’s look at what causes Outlook to crash, how you can fix it, and a smarter tool that takes a lot of the stress off your plate. Find solutions to common problems or get help from a support agent. The folder may have been deleted or the server where the folder is stored may be unavailable.

Outlook Known Issues in November 2021 updates



You don't have appropriate permission to perform this operation. There is currently no option to revert to the prior behavior, but we would love to hear your feedback to help us with future designs. To learn more about how to send us feedback, please see How do I give feedback on Microsoft Office. To access the filtering options faster, reset cached Exchange mode add them to your Quick Access Toolbar. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. This issue affects all Outlook versions on Windows 7, Windows 8, Windows 10.

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 work offline mode stuck TrustedTech, can expedite resolution and minimize downtime. Our licensing engineers can help triage complex problems and ensure you're on the right support path.
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