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public.It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.

Learn how to download, install, and configure Language Accessory Packs for Microsoft 365 for additional display, help, and proofing tools.

If you're having trouble using the Outlook for Android mobile app, Open an in-app Outlook support ticket. If you have a work or school account that uses Microsoft 365 for business or Exchange-based accounts, there may be additional requirements set by your IT admin.

Roaming of the work account's device certificate is not supported. The certificate, issued by "MS-Organization-Access", is stored in the Personal (MY) certificate store of the current user and on the local machine.

Always check the sender's email address and confirm that it makes sense for the message you've received. 2. To whom it may concern. If they don't know your name, they can't withdraw any funds from your bank account.

Important: This article contains information on how to lower security settings or disable security features as a "workaround" for a specific problem.You should evaluate the risks associated with such workarounds in your particular environment. Before implementing a workaround, take appropriate additional steps to help protect the computer.

解决激活错误. 如果 Microsoft 365 无法激活，其最后会变为未授权，且 Microsoft 365 的所有编辑功能都会被禁用。 Microsoft 可能由于多种原因变为未授权。

If the self-help answers don't resolve your issue, try a different search, or scroll to the bottom of the Help pane and, under Still need help?, select Yes.

These terms are used when your message has been intentionally blocked by a spam or blacklist filter on the recipient's email server. The recipient's server believes that the mail server or mail account that you're using is a source of spam.

Important: Microsoft accounts, the Windows operating system, and other Microsoft products include passwords to help secure your information.This article provides some options that you can use to reset or recover your password if you forget it. Be aware that, if these options don’t work, Microsoft support can't help you retrieve or circumvent a lost or forgotten password.