If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product.

Find out which power supply model goes with your Surface device—including the power supply model number, power and wattage, and USB charging port.

Compose a message now, but schedule it to be sent later.

There are two ways to open Registry Editor in Windows 10: In the search box on the taskbar, type regedit, then select Registry Editor (Desktop app) from the results.

Set up headers and footers to provide different content for different sections of a document.

Training: With Microsoft Access, you don't have to be a developer to create a database to help your team work more efficiently. Watch this online video to see how.

Get help if your Surface Pen isn't working or you're having problems writing. Troubleshoot problems related to your Surface Pen.

Learn how to turn on or off your search history in Microsoft Support, and how it affects your privacy and browsing data.

Training: Get started with SharePoint in Microsoft 365. At office.com, sign in to SharePoint, then select the SharePoint tile.

症状. 当你离开家并使用家庭电子邮件帐户发送电子邮件时，你的电子邮件可能会返回并显示 550、553 或中继禁止的错误消息。