Certificate authority (CA) A certificate authority is an entity similar to a notary public.It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.

Use Version History to view previous versions of files stored in OneDrive or SharePoint libraries.

若要将其关闭，请将设置切换为“关闭”。 关闭 Microsoft Defender 防火墙可能会使设备（以及网络，如果有）更容易受到未经授权的访问。

Using clipboard. When you copy content on your PC, it’s automatically copied to your clipboard for you to paste. You can paste multiple items from your clipboard history, and you can also pin the items you tend to use all the time and sync your clipboard history to the cloud.

If you choose the Do Not Forward option, there are two possibilities:. Microsoft Office attachments such as Word, Excel or PowerPoint files remain encrypted even after they’re downloaded. This means that if the recipient downloads the attachment and sends it to someone else, the person they forwarded it to won’t be able to open the attachment because they don’t have permission to open it.

Ask for design ideas any time by choosing Design > Designer on the ribbon.. If Designer doesn't have any design ideas for you or you don't see the Designer button, there are a few possible reasons for that situation. Want to learn more about Designer?

Select this option to import Internet Explorer Browsing History into Microsoft Edge. Because the Top sites shown in the New tab page are generated based on the browsing history in Microsoft Edge, you may see the Top sites change based on the imported history data.

Analyze Data in Excel empowers you to understand your data through high-level visual summaries, trends, and patterns. Simply click a cell in a data range, and then click the Analyze Data button on the Home tab. Analyze Data in Excel will analyze your data, and return interesting visuals about it in a task pane.

Type the email address of the other mailbox that you want to open and then select Open.Or, start typing and then select Search contacts and directory to find the mailbox you want to open. Select the shared mailbox you want to open, and then select Open.Another Outlook Web App session opens in a separate window, allowing access to the other mailbox.

Safe senders and recipients. Safe senders are people and domains you always want to receive email messages from. Safe recipients are recipients that you don't want to block, usually groups that you’re a member of.