Digital signatures provide assurances about the validity and authenticity of digital documents.

How to troubleshoot Outlook when search isn’t working (returning no results, incomplete results, can’t find older emails, and more).

在 “个性化设置背景”旁边的列表中，选择“图片”、“ 纯色”、“ 幻灯片放映”或“ Windows 聚焦 (”，) 查看来自世界各地的新图像。

This article describes the formula syntax and usage of the FIND and FINDB functions in Microsoft Excel.. Description. FIND and FINDB locate one text string within a second text string, and return the number of the starting position of the first text string from the first character of the second text string.

Learn why you received a notification about unusual activity in your account and what to do next.

Learn how to fix graphics device driver error code 43 in Windows 10.

Learn how to receive a refund or exchange for items purchased from Microsoft.

Learn how to change the email address or phone number that’s associated with your Microsoft account.

Discusses how to troubleshoot problems that occur when you try to access or work with files and folders in Windows.

Get help with signing in, changing passwords, creating and sending mail, deleting mail, creating folders, and more in Outlook on the web.