Find your product key to activate Windows. A product key is a 25-character code that's used to activate Windows and helps verify that Windows hasn't been used on more PCs than the Microsoft Software License Terms allow.

有关如何更改 Microsoft 帐户上的名称的说明。

To reset your PC, go to Start > Settings > System > Recovery .Next to Reset this PC , select Reset PC.Then, select Keep my files, choose cloud or local, change your settings, and set Restore preinstalled apps? to No.. Open Recovery settings

sum_range Optional.The actual cells to add, if you want to add cells other than those specified in the range argument. If the sum_range argument is omitted, Excel adds the cells that are specified in the range argument (the same cells to which the criteria is applied).. Sum_range should be the same size and shape as range.If it isn't, performance may suffer, and the formula will sum a range of ...

Learn how to join a Microsoft Teams meeting if you don't have an account. Join a Teams meeting as a guest in the Windows app or on the web.

File Explorer in Windows 11 helps you get the files you need quickly and easily. To check it out in Windows 11, select it on the taskbar or the Start menu, or press the Windows logo key + E on your keyboard.. How to use File Explorer:

Ensure these modes create an alert that is visible on your device. Make sure you have a device signal and Internet connection. Make sure your phone calls and text messages are getting through to your mobile device.

Argument name. Description. range (required). The group of cells you want to count. Range can contain numbers, arrays, a named range, or references that contain numbers. Blank and text values are ignored. Learn how to select ranges in a worksheet.. criteria (required). A number, expression, cell reference, or text string that determines which cells will be counted.

Microsoft account help and support. Get help with signing in, locked or compromised accounts, linked accounts, closing, reopening, and updating your security info and account profile.

Invisible digital signatures in Word, Excel, or PowerPoint. An invisible digital signature, like a visible digital signature line, assures the authenticity, integrity, and origin of a document.