Excel is blocking untrusted XLL add-ins by default. Add-ins can add a lot of functionality to Microsoft 365, but they are often used by people with bad intentions to distribute malware to unsuspecting victims. Add-ins aren't required for everyday use like reading or editing Excel workbooks.

如果经常从受信任的云位置（例如公司网站或内部文件服务器）下载文件或直接打开文件，则可以在 Windows 中将站点设置为受信任的站点，以便不会检查站点中的 XLL 文件。

Fix Bluetooth problems in Windows. If you run into problems trying to connect to a Bluetooth device, here are some troubleshooting steps to try. Note: For general info about how to connect a Bluetooth device to your PC, see Pair a Bluetooth device in Windows.

Use the XLOOKUP function to find things in a table or range by row. For example, look up the price of an automotive part by the part number, or find an employee name based on their employee ID.

We understand that sometimes purchases of digital game products don’t go as planned. When that happens, we’ll help you request a refund. Refunds are typically issued for requests meeting the following criteria: Requests are made within 14 days of the purchase date.

The most common type is a physical, external keyboard that plugs into your PC. But Windows has a built-in Accessibility tool called the On-Screen Keyboard (OSK) that can be used instead of a physical keyboard. You don’t need a touchscreen to use the OSK.

The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

Open Microsoft Edge, select Settings and more > Settings . Select Appearance. Turn on Show home button. You can either choose New tab page or select Enter URL for a page that you want to use as your home page. Note: This topic is for the new Microsoft Edge . Get help for the legacy version of Microsoft Edge .

Protect your Android, iPhone, Mac, and Windows devices from threats by installing Microsoft Defender. Download Microsoft Defender on your devices either by: Scanning the following QR code. Searching for Microsoft Defender in your app store. Sharing with your devices, the following link: Copy link.

Exchange account server settings. Office 2016 for Mac. If you are trying to set up an Exchange account in Outlook, ask the organization that gave you the email address for the name of your Exchange server. It's standard for them to provide you with this information so you can add your email address to a computer or phone.