Important: You don't need to remove old security information unless there is an account security risk (e.g. someone else has access to your old mailbox).

Get productive quickly with Microsoft 365 videos and tutorials. Explore Microsoft 365 training guides and tips to collaborate with anyone, anywhere.

Download our Formulas tutorial workbook. We've put together a Get started with Formulas workbook that you can download. If you’re new to Excel, or even if you have some experience with it, you can walk through Excel’s most common formulas in this tour.

This article is for Outlook.com. If you're using Outlook for Windows, see Fixes or workarounds for recent issues in Outlook for Windows.. If you're having problems accessing Outlook.com, you can see the status of Microsoft Office Online Services at the Service Health portal.. If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues.

Looking for a long-lost app or program? There are several ways you can find what you need. Select Start , and then scroll through the alphabetical list on the left (if your Start screen is set to show as full screen, select All apps, and then scroll through the list).

Windows Hello 是登录到 Windows 设备的一种更个性化、更安全的方式。 在 Windows Hello 中，你可以使用面部识别、指纹或 PIN 登录，而不是使用密码。

In the following example we used the formula =FILTER(A5:D20,C5:C20=H2,"") to return all records for Apple, as selected in cell H2, and if there are no apples, return an empty string ("").

Explore the new and refreshed apps of Windows 11, from Photos to Microsoft Store. Watch the video and read tips to find tools to stay creative and productive, whether on your phone or on your PC.

Your PC can run Windows 11 if it meets minimum (basic) system requirements. For information on basic system requirements and additional requirements for specific features, see Find Windows 11 specs, features, and computer requirements.

Why accounts are locked and disabled. Microsoft accounts are usually locked if the account holder has violated our Microsoft Services Agreement.Here are some common reasons why accounts are locked, though not all account locks occur for these reasons: