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Removing and re-adding the account using the standard Sign In method will resolve this error. My concern is that MS will force modern authentication soon, and switch off basic authentication. expert Outlook tips by FixTechGuide Is there some kind of setting within O365 that’s forcing Outlook to use basic authentication ? Other apps are using modern authentication perfectly well, including Team The sync will fail if the groups you selected to load users from no longer exist in Azure AD. Typically this is because the selected groups have been deleted from Azure AD since the M365 sync was configured on your account. If you don't wish an inactive user to be made active by the M365 sync, you can add the user's email address to the sync forbid lis If Outlook reconnects successfully, the OST issue was likely caused by temporary disconnection from Office 365 servers. If the OST works properly, disable unnecessary add-ins from File → Options → Add-ins. But knowing the process on how slow my local expert Outlook tips by FixTechGuide state government takes to fix things, it could be a long tim If you’re unable to sign in to your Microsoft 365 account, ensure you’re using the correct email and password. Locked accounts, due to multiple failed attempts, may require waiting or following unlock instructions. Check your internet connection, as weak connectivity can cause issues. For work or school accounts, confirm with your organization that your account is active. Browser or app issues, like outdated software or cached data, can also interfere; try clearing your cache or switching browser They were both connected to office 365, when suddenly one day it said "updating inbox" and that's it. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Here is a comprehensive list of possible causes for the error ‘Outlook inbox not updating’ and how they can affect the working of Outlook. By applying this sort order (which is default in Outlook), you'll be always seeing the most recent communications firs Make sure the system has enough storage, especially the volume where the Outlook data file (OST) is stored. If you are running out of storage, make some space by moving some files from the storage to another folder or volume. You may also archive the OST mailbox to reduce the mailbox size. It stores a copy of mail items on the mailbox server in the OST file on the local machine. The changes made in Outlook are expert Outlook tips by FixTechGuide stored in the OST file and synchronized frequently with the mailbox serve Remember, if all else fails, reaching out to Microsoft Support directly or using their official support documentation can provide tailored assistance for complex organizational setups. With the right planning and knowledge, nearly all sign-in and activation troubles can be resolved quickly and efficiently. Completing expert Outlook tips by FixTechGuide the above steps resolves a large majority of typical sign-in and activation problems. If the issue persists, Microsoft has created a dedicated tool called Microsoft Support and Recovery Assistant (SaRA) to automate many troubleshooting task Upgrade to Microsoft Edge to take advantage of the latest features, security expert Outlook tips by FixTechGuide updates, and technical support. Windows 10 will reach EOS (end of support) on October 14, 2025. Create your account and connect with a world of communitie A corrupted OST file can pause your business communication, but with these repair steps you can restore your Outlook in minutes. Follow each method carefully, keep your account synced to Office 365, and maintain regular backups to avoid future data loss. You’ll see files ending with ".ost" — these store your cached mailbox data. Yes — Outlook will re-sync mailbox data from the server once you relaunch the app, as long as you use an Exchange or Office 365 account. Worst nightmare for paying Bills and Trading Card Sellers like me since the out letter slot is unavailable too, so I have to go to the post office as well to send out letter To add your Exchange Online email account to Outlook, use either of the following resolutions. So, it looks like the version of Outlook that I have won’t play nice with Modern Authentication. I have confirmed that on two different PCs that are accessing the same mailbox with the same version of Outlook, which is the latest version from Microsoft included within my Office 365 package. Outlook is working on my phone, and I can access everything via the office.com web site. Now I am constantly being asked to enter passwords for two of my Comcast addresses (my Gmail address works fine). Searched till my fingers bled; gave up and installed the free "Windows Outlook", but it was a mess that I can't tak Those versions have been updated to prevent the problem that is described in the "Symptoms" section. These expert Outlook tips by FixTechGuide versions have the Logon network security setting disabled or removed from the Microsoft Exchange email account settings. It requests me to login to my microsoft account. I then approve the login with my authenticator ap