When you update a contact’s email address in Outlook, the autocomplete list may still display the old address when you start typing in the To field. This happens because Outlook stores a separate nickname cache that is not automatically refreshed when a contact changes. This article explains why the nickname cache overrides the updated address … Read more
When you send an email from a shared mailbox in Outlook, the sent message often appears in your personal mailbox Sent Items folder instead of the shared mailbox Sent Items. This happens because Outlook by default saves sent items to the sending account, not the mailbox from which the message was sent. This article explains … Read more
When you try to add a delegate in Outlook and grant them Send on Behalf permission, you may see an error message or the delegate simply does not appear in the list. This problem usually occurs because of permission conflicts, Active Directory replication delays, or corrupted Outlook profiles. This article explains the root causes of … Read more
After rebuilding your Outlook profile, you may find that your saved Quick Parts — reusable blocks of text, signatures, or templates — have disappeared. This happens because Quick Parts are stored in the NormalEmail.dotm template file inside your old profile folder, and a new profile does not automatically carry that file over. This article explains … Read more
After renewing your digital certificate, Outlook may refuse to open encrypted emails you received before the renewal. You see an error like “Outlook cannot open this item” or “The digital signature is invalid.” This happens because the old certificate that was used to encrypt the message is no longer available in your certificate store. This … Read more
You open Outlook, and it asks you to enter your multi-factor authentication code again even though you just did this yesterday. This repeated MFA prompt interrupts your workflow and wastes time. The root cause is usually a broken or missing authentication token that Outlook needs to remember your sign-in session. This article explains why this … Read more
When Outlook connects to the wrong Microsoft 365 tenant, you see a login prompt for an unfamiliar account or receive authentication errors. This happens because Autodiscover looks up the domain’s DNS records and may resolve to an old or incorrect tenant ID instead of the current one. The wrong tenant issue often occurs after a … Read more
You open Control Panel, go to Mail, and click Show Profiles. You select the profile you want to delete and click Remove, but nothing happens or the Remove button is grayed out. This problem occurs because Windows or Outlook has a lock on the profile files, the profile is set as the default, or the … Read more
You are trying to send an email from a specific email account in the new Outlook for Windows, but the From field keeps reverting to a different address. This problem occurs because the new Outlook strictly enforces a default sending account setting that overrides manual From selections in certain views. This article explains why this … Read more
You granted a delegate access to your Outlook calendar, but they report that private appointments and meetings are hidden or blocked. This happens even though the delegate has Editor or Author permissions on the folder. The cause is a single permission setting that controls whether delegates can view items you mark as private. This article … Read more