若要在 Outlook.com 中获取支持，请单击此处或选择菜单栏上的帮助，然后输入查询。 如果自助服务无法解决问题，请向下滚动到“仍需要帮助？”，然后选择“是”。 若要在 Outlook.com 中联系我们，需要登录。

Cookies are small pieces of data stored on your device by websites you visit. They serve various purposes, such as remembering login credentials, site preferences, and tracking user behavior.

Important: you should limit the number of administrators on your Windows device because administrators have complete control over the system.Administrators can change settings, install software, and access all files. If too many people have this level of access, it could lead to security risks like malware installation or unwanted changes to your system.

Select OK.Type a password in both the Password and Verify Password text boxes and select OK again.. If you set a password, you must enter it every time that the data file is opened — for example, when Outlook starts or when you open the data file in Outlook.

Tips: While signing in, select Yes at the "Stay signed in?" prompt if you want to go straight to your mailbox next time (not recommended for shared computers). Alternatively, check the "Don't show this again" box and select No to be prompted for your password each time.. If you can't sign in, or have forgotten your username or password, use our sign-in troubleshooter.

Windows 11 lets you quickly check your network connection status. Select the Start button, then type settings.Select Settings > Network & internet.The status of your network connection will appear at the top.

Select the temporary files, unused files, files synced to the cloud, or unused apps you want to remove, then select the Clean up button for each section.

Note: Recovery drives created and used on machines with the April 9, 2024 security update and the revocation policy applied may be impacted.For more, see KB5025885: How to manage the Windows Boot Manager revocations for Secure Boot changes associated with CVE-2023-24932.

Note: If you start to play a DVD or VCD in the Player Library, the Player automatically switches to Now Playing mode. The Blu-ray Disc format is not supported in Windows Media Player. To play a Blu-ray Disc, you need to use a non-Microsoft program that supports Blu-ray playback and a device capable of reading Blu-ray Discs.

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.