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on January 15, 2026
Are you having trouble starting Outlook or receiving "Cannot start Microsoft Outlook. Cannot open the Outlook window" error messages? We can fix the problem for you, or you can use the troubleshooting steps we're providing below to help resolve these startup issues. Your Outlook profile holds all your account settings and data configurations.
It supports corrupt Fix Outlook official help BKF/ VHDX files created in MS Exchange 2016 and previous versions. There are multiple recovery modes in the software to repair the Outlook PST files. You can opt for the desired Mode of Recovery, i.e., Standard, Advanced, and Deep, as per the level of corruption in the PST file. With the help of the PST File Repair Software, you can repair the PST file using the Deep Mode that is severely damaged to a great extent. The Cigati PST File Recovery software is a powerful tool that can handle even severely damaged Outlook email files.
Recovery Toolbox for Outlook uses Microsoft Outlook for creation of new PST files. The new version of the PST file with recovered data will be equal to the Microsoft Outlook version installed on the computer. I need to convert a large .ost file to a .pst file to set up a new laptop. Recovery Toolbox worked very well and relatively quickly.
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. You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile. 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.
Customers using the contact support buttons at the foot of the support pages, or the "email us" links in support Virtual Agent, are unable to open the Help Pane. If you used the workaround below you can now switch from using an Outlook.com alias to your country's domain. You might need to set Fix Outlook official help Windows Update to automatically download and install recommended updates.
If you lose your connection to the internet, classic Outlook won't be able to send your messages. To fix this problem, on the ribbon, select the Send/Receive tab, then, in the Preferences group, select Work Offline to toggle between offline mode and online mode. You may need to open the message and send it again or choose Send/Receive.
While we fix the problem, you can send the file as a OneDrive link. When users select the Manage Microsoft Storage quota link at the bottom corner in Outlook.com, they are taken to a blank Settings page. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally. For more information on creating a new email profile, see Create an Outlook profile. To start Outlook in safe mode, press the Windows Fix Outlook official help key on your keyboard. In the search box, type outlook.exe /safe, then press Enter.
Repairing is a simple process but may take as long as half an hour to complete. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. We love reading your suggestions on new features and feedback about how you use our products! To learn more about how to share your feedback, see How do I give feedback on Microsoft Office. Set up your account manually as an IMAP or POP account in Outlook. Visit Firefox support to learn how to Disable or remove Add-ons.
I'm having an issue with one Outlook 365, the program open and get stuck at loading the user profile, any profiles. Corrupted PST or OST data files can prevent Outlook from loading. Microsoft’s ScanPST tool can repair minor corruption; more severe cases may require deleting and rebuilding the data file.
It 'Compresses' or 'Splits' the repaired PST that reduces further chances of corruption. Stellar Repair for Active Directory (AD) checks, analyzes, and repairs corrupt Active Directory databases. The software restores repaired AD Fix Outlook official help objects on a different machine with same domain name. If you're unable to use the Sign-in Helper to get into your account because your recovery info is wrong or inaccessible, you may not be able to regain access to your account again. You're always welcome to sign up for a new account, but just make sure to keep your new account's recovery info up to date. If the recovery options displayed for your account are out-of-date, go to the "Can't sign in after trying the steps above?" section of this help article for more info.
Moreover, this utility allows you to repair multiple PST files simultaneously without needing any modifications. Whether you're dealing with ANSI or Unicode PST files, the tool can effectively recover them, ensuring data integrity and recovery. Stellar Repair for Outlook Technician repairs corrupt PST files and recovers complete mailbox data.
Stellar Repair for Outlook is a professional tool to repair large and severely corrupt PST files and restores data with 100% precision. It supports recovery from Outlook 2019, 2016, and earlier versions. Stellar Mailbox Extractor for Exchange Backup repairs and extracts data from corrupt Exchange BKF & VHDX backup files. This software also exports offline mailboxes to live Exchange Server.