There's no limit to how many times you can make changes to a sent message. Delete a sent message. If you need to backtrack and delete something you just sent, go to the message and select More options > Delete.. If you haven't sent the message yet, select Format to expand the box and then click Delete in the upper right-hand corner.. Undo a deleted message

CAUTION After the mitigation for this issue is enabled on a device, meaning the mitigations have been applied, it cannot be reverted if you continue to use Secure Boot on that device. Even reformatting of the disk will not remove the revocations if they have already been applied. Please be aware of all the possible implications and test thoroughly before you apply the revocations that are ...

本文介绍 Microsoft Excel 中 SUBSTITUTE 函数的公式语法和用法。. 说明. 在文本字符串中用 new_text 替换 old_text。 如果需要在某一文本字符串中替换指定的文本，请使用函数 SUBSTITUTE；如果需要在某一文本字符串中替换特定位置处的任意文本，请使用函数 REPLACE。

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Tip: If you've invited an external participant to be a guest speaker and you want to further limit their access to the meeting chat, you can schedule their presentation as the meeting's last session.The meeting organizer or moderator can then monitor the participant list during the meeting, and if the speaker joins outside their allocated time, they can manually remove them.

Going passwordless refers to removing your password and using a passwordless method to sign in instead. Passwordless solutions such as Windows Hello, the Microsoft Authenticator app, SMS or Email codes, and physical security keys provide a more secure and convenient sign-in method. While passwords can be guessed, stolen, or phished, only you can provide fingerprint authentication, or provide ...

For more about the benefits of creating a Microsoft family see the Microsoft family FAQ.. For information about setting up your Microsoft family, see Add members to your Microsoft family.. Why was Office automatically shared with my family?

Important: If your Microsoft cloud storage is full, you cannot send or receive email.Messages sent to you while your storage was full are bounced back to the sender and are unrecoverable. Check your mailbox storage to see what's taking up space. Learn more about recent changes.

Check your computer's date settings. Excel uses your computer's date system. If a cell's date isn't entered using the same date system, Excel won't recognize it as a true date.