When you sync your Outlook calendar with Apple iCloud, duplicate events can appear on both platforms. This happens when the iCloud for Windows app or manual import methods create overlapping copies of the same appointment. In this article, you will learn how to configure a clean sync that prevents duplicate events from appearing in Outlook. … Read more
When you add or update a contact photo in the Microsoft 365 admin center or in Exchange Online, the new image often fails to appear in Outlook. The contact card in Outlook may show a generic silhouette or an outdated photo. This problem occurs because Outlook relies on a cached copy of the directory photo, … Read more
If you manage an Exchange or Microsoft 365 environment, you may need to help users quickly find colleagues by their position in the company structure. The Outlook Hierarchical Address Book, or HAB, displays recipients in an organizational tree based on the company’s management hierarchy. This feature replaces the flat global address list with a view … Read more
When you upgrade Outlook from an older version that uses a .nk2 file for nickname autocomplete to a newer version that uses RoamCache, the migration of your cached address book entries may not happen automatically. This can leave you without your frequently used email addresses and contact suggestions. The migration is triggered by specific Outlook … Read more
You want your Outlook email signatures to appear the same on your work PC, home laptop, and any other Windows device you use. By default, Outlook stores signatures locally on each computer, so a signature you create on one machine does not show up on another. Microsoft provides a roaming signatures feature that syncs your … Read more
When you assign color categories to emails, contacts, or calendar items in Outlook, you expect those categories to appear on every device you use. However, many users find that categories added on one computer do not show up on another, even when both are connected to the same Exchange or Microsoft 365 mailbox. This happens … Read more
If your primary drive is running out of space, the Outlook OST file — which stores a cached copy of your mailbox — is often the culprit. This file can grow to tens of gigabytes, especially with large mailboxes and shared folders. Moving the OST file to a larger secondary drive frees up space on … Read more
When you see the error “Folder Subscription Limit Exceeded” in Outlook, it means you have more folders subscribed than your account allows. This typically happens in Microsoft 365 or Exchange Online accounts where administrators set a maximum of 500 subscribed folders per mailbox. The error prevents you from seeing new messages in some folders or … Read more
Sensitivity labels from Microsoft Purview let you classify and protect email content directly in Outlook. These labels apply encryption, watermarking, and header markings to prevent data leaks. You might need to apply a label because your organization requires it for compliance or because you want to control who can read or forward an email. This … Read more
When you send an email in Outlook, recipients cannot always verify that the message came from you and has not been altered. S/MIME (Secure/Multipurpose Internet Mail Extensions) solves this by letting you digitally sign your emails using a personal certificate. Without a properly installed certificate, Outlook cannot apply the signature. This article explains what an … Read more