How to use the COUNTIF function in Excel to count the number of cells that meet values you set.

Probeer deze oplossingen als u zich niet kunt aanmelden bij uw Outlook.com-, Hotmail-, Live- of MSN-e-mailaccount of als u niet goed weet hoe u zich moet aan- of afmelden.

Learn how to locate your Microsoft Office product key, which allows you to activate and use your Office products without requiring a Microsoft account.

Learn how to install Office 2013 on your PC or Office for Mac 2011.

On another Windows PC or other device, connect to Wi-Fi as you normally would, and enter your Wi-Fi password when prompted. For more info about connecting to Wi-Fi, see Connect to a Wi-Fi network in Windows.

Learn how to enable virtualization through the UEFI (or BIOS) of your PC to run the Windows Subsystem for Android or Windows Subsystem for Linux.

如果你有多个要插入的 5 毫米插孔（尤其是在环绕音响系统上），请确保所有电线和线缆都插入到了正确的插孔中。

Defragment your Windows 10 PC. Optimizing your drives can help your PC run smoother and boot up faster.

Learn how to update Microsoft Office on PC and troubleshooting tips for installing Office updates.

There are a number of possible explanations for why verification codes don't always arrive. Read through the list of the most common causes, and see if any of them apply to you, or use our troubleshooter to help guide you.