After a user is renamed in Microsoft 365 or their display name is changed in Exchange Online, Outlook in Cached Exchange Mode may continue to show the old mailbox name in the folder pane. This happens even after restarting Outlook or waiting for the offline address book to update. The root cause is a locally … Read more
When you create a new Outlook profile, Quick Steps often disappear from the Home ribbon. This happens because Quick Steps are stored in the registry under your old profile, not in the mailbox on the server. This article explains why Quick Steps vanish and provides a step-by-step method to restore them from your previous profile. … Read more
You are trying to add an Outlook account to a device or app that does not support modern authentication, but the app password you generated fails to connect. This problem occurs because Microsoft has disabled app passwords for tenants using modern authentication, yet some legacy apps still require them. This article explains why app passwords … Read more
After a Microsoft 365 tenant change, such as a domain migration or tenant-to-tenant migration, some users cannot send email from an alias address in Outlook. The error typically says the message cannot be sent because the account does not have permission to send from that address. This problem occurs because the alias is not properly … Read more
When you rebuild an Outlook profile to fix corruption or performance issues, all your email rules are lost unless you export them first. Outlook stores rules locally in the profile, not on the server, so a new profile starts with no rules. This article explains how to export your Outlook rules to a file, so … Read more
Rebuilding your Outlook profile is a standard troubleshooting step for sync problems, but it often fails to resolve the issue. When you delete and recreate your profile, Outlook downloads a fresh copy of your mailbox from the server. If the sync problem originates from a corrupted offline data file, a damaged Outlook data file, or … Read more
After a tenant-to-tenant migration in Microsoft 365, Outlook may repeatedly prompt you for your password even though you have already entered the correct credentials. This happens because Outlook caches the old authentication tokens and server endpoints from the previous tenant. The cached data conflicts with the new tenant configuration, causing authentication loops. This article explains … Read more
After changing your Microsoft 365 password, Outlook may refuse to add your account again. The error often appears as a repeated password prompt or a message that Outlook cannot connect to the server. This happens because Outlook caches old credentials in Windows Credential Manager and in the registry. This article explains why the cached data … Read more
Adding a Google Workspace account to Outlook using OAuth sign-in lets you send and receive Gmail messages and manage Google Calendar events directly from the Outlook interface. OAuth is the modern, secure authentication method that replaces the older app passwords and basic authentication. This article explains how to configure Outlook to connect to your Google … Read more
Outlook users see a sign-in failure with the message “You cannot access this resource” or “Connection to Microsoft Exchange was lost.” The root cause is often a Conditional Access policy in Microsoft Entra ID (formerly Azure Active Directory) that blocks the specific authentication request. This article explains how to identify which policy is blocking the … Read more