Certificate authority (CA) A certificate authority is an entity similar to a notary public.It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.

On the Invoices tab, choose the invoice that you want to view.If you don't see an invoice, use the date filter and select Past 3 months, Past 6 months, or Specify date range.

You can use data from a Excel worksheet as the basis for a PivotTable or PivotChart. The data should be in list format, with column labels in the first row, which Excel will use for Field Names.Each cell in subsequent rows should contain data appropriate to its column heading, and you shouldn't mix data types in the same column.

Outlook won't accept my password. If you've forgotten the password for a Microsoft account, user our sign-in helper to get back into your account.. If you know you’re using the correct password for your email account but Outlook won’t accept it, you might have an email account that requires additional security.

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。

No matter where you live, work, or roam, there’s a version of Microsoft OneNote to fit your needs. Whether you’re on a PC, a Mac, in a browser, or on a mobile device, each version of OneNote lets you reliably access your cloud-connected notebooks to capture your thoughts and ideas.

New or classic Outlook for Windows desktop apps Classic Outlook for Windows is a desktop app included with Microsoft 365 Personal or Family subscriptions or non-subscription versions of Office such as Office Home & Business. New Outlook for Windows is available free on Windows devices or as a free download.If you don't already have new Outlook, you can download it from the Microsoft Store ...

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Protect your most important files, like your passport, driver’s license, or insurance information with OneDrive Personal Vault. Get started with Personal Vault. Explore OneDrive. Protect & restore. Manage security, backup, and restore options for your files and photos.