If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track.

Being certified as an MOS Expert demonstrates you have advanced skills in key Office programs. Find training and earn an MOS Expert certification. MOS Master --Pass exams in Word or Excel to earn a Microsoft Office Specialist Master certification.

Locate your product key for Windows 10 or Windows 11. Depending on how you got your copy of Windows 10 or Windows 11, you'll need either a 25-character product key or a digital license to activate it.

Here's an example of how to use VLOOKUP. =VLOOKUP (B2,C2:E7,3,TRUE) In this example, B2 is the first argument —an element of data that the function needs to work. For VLOOKUP, this first argument is the value that you want to find. This argument can be a cell reference, or a fixed value such as "smith" or 21,000.

This feature allows you to access your previously downloaded or synchronized email messages, calendar information, contacts, and tasks without an internet connection. Certain types of accounts, such as POP accounts, store their information in Outlook Data Files ( .pst files).

CVE-2022-34691, CVE-2022-26931 and CVE-2022-26923 address an elevation of privilege vulnerability that can occur when the Kerberos Key Distribution Center (KDC) is servicing a certificate-based authentication request.

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC.

全球客户服务电话号码. 要查找你所在国家/地区的客服电话号码，请单击一个地区并查找你所在的国家/地区。. 注意: Surface 设备的支持案例只能 在线 启动。. 本页提供 Microsoft 客服的电话号码。.

激活 Microsoft 365 或非订阅版本的 Office. 当启动未激活的 Microsoft 365 应用时，系统将提示登录到 Microsoft 365。. 请务必使用用于购买或订阅 Microsoft 365 的 Microsoft 帐户或工作或学校帐户进行登录。. 注意: 如果新设备上预安装了 Microsoft 365，请参阅 激活新 Windows 设备上 ...

步驟 1 ：請移至 www.microsoftstore.com ，並以購買 Office 時所用的 Microsoft 帳戶登入 (右上角)。. 步驟 2 ：登入之後，在右上角選取您的名稱，然後選取 [購買記錄] 。. 步驟 3 ：找到買斷型購買的 Office 或個別的 Office App，然後選取 [安裝 Office] 來檢視您的產品金鑰 (這 ...