About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

Send S/MIME or Microsoft Purview encrypted emails in Outlook using a work or school account with a qualified Microsoft 365 subscription.

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

Learn how to download files from the web, change your default download location, and find files you've downloaded on your PC using Internet Explorer.

Learn how to download and install apps you need from your Microsoft 365 business subscription.

Learn how to use drag and drop to transfer content between your Android device and PC.

Careers About Microsoft Company news Privacy at Microsoft Investors Diversity and inclusion Accessibility Sustainability English (United States) Your Privacy Choices Consumer Health Privacy Sitemap Contact Microsoft Privacy Terms of use Trademarks Safety & eco Recycling About our ads © Microsoft 2025

當您將電子郵件帳戶新增至 Outlook時，您的資訊本地副本會儲存在您的電腦上。 這項功能可讓您在沒有因特網連線的情況下，存取先前下載或同步處理的電子郵件訊息、行事曆資訊、聯繫人和工作。 某些類型的帳戶，例如 POP 帳戶，會將其資訊儲存在 Outlook 數據檔 (.pst 檔案) 。 Outlook 365 帳戶、Exchange ...

Learn how to use Snipping Tool to capture a screenshot, or snip, of any object on your screen, and then annotate, save, or share the image.

Don't forget to include your license ID or agreement number, your contact phone number & email address so we can contact you. If you already have a volume licensing support case number, you may be in a location where you can phone the Volume Licensing support team.