Learn how to get Microsoft account help, troubleshoot sign in issues, keep your account secure, and manage your Microsoft account dashboard.

Repair or reset Windows Media Player: If Windows Media Player is not working properly, you can try to repair or reset it to its default settings.To do this, Select Start > Settings > Apps > Installed Apps.. Scroll down and click the three horizontal dots next to Windows Media Player and choose Advanced options, and click the Repair or Reset button. Note that resetting Windows Media Player will ...

Why some files won't open in Internet Explorer. Internet Explorer uses add-ons such as Adobe Reader to view some files in the browser. If a file that needs an add-on won't open, you might have an older version of the add-on, which needs to be updated.

Find Microsoft Excel help and learning resources. Explore how-to articles, guides, training videos, and tips to efficiently use Excel.

注: [アカウント] が表示されない場合、または既にファイルまたはドキュメントを開いている場合は、メニューから [ファイル] を選び、左側の一覧から [アカウント] または [サポート] を選択します。 [製品情報] の下に、Office 製品の名前と、場合によっては完全なバージョン番号が表示されます。

Efficiency mode What is efficiency mode in Microsoft Edge? Efficiency mode is designed to help extend battery life. It minimizes power usage by reducing resource usage through modifying background tab activity and some foreground activity, as well as putting inactive background tabs to sleep after 30 minutes or less of inactivity (if Save resources with sleeping tabs is on).

The Office Clipboard allows you to copy up to 24 items from Office documents or other programs and paste them into another Office document. For example, you can copy text from an email message, data from a workbook or datasheet, and a graphic from a presentation, and then paste them all into a document.

如果找不到恢复密钥，该怎么办？ 如果设备由组织管理，请与 IT 部门联系以检索恢复密钥。 如果找不到 BitLocker 恢复密钥，并且无法撤消导致需要它的任何更改，则必须使用 Windows 恢复选项之一重置设备。. 重置你的设备将删除所有文件。

Alarms and timers work even if the app is closed or your device is locked. If you see a warning that notifications only show if the device is awake, make sure your device doesn’t go to sleep (Go to Start > Settings > System > Power & battery , then select Screen, sleep, & hibernate timeouts to adjust your device’s sleep settings).

To learn more, see Start an instant meeting in Microsoft Teams.. Call in. If you can't use the Teams app or Teams for web, join some meetings by phone number. Learn more here: Join a Teams meeting by phone. If you find a phone number and conference ID in the meeting invite, dial the number to join.