Obtain a digital certificate and create a digital signature
Learn what a digital signature or ID is, how to get one from a certificate authority or create your own, and how to use it in Office documents. Find out how to view, add, or remove digital signatures and certificates in different versions of Windows and Office.
Add or remove a digital signature for Microsoft 365 files
Learn what digital signatures are, how to create and remove them in Microsoft 365 files, and how they can be used for authentication and notarization. See steps for inserting signature lines, signing them, and removing them in Word and Excel.
Obtain a digital certificate and create a digital signature
Learn how to use a digital certificate to sign Office documents and authenticate digital information. Find out how to obtain a digital certificate from a third-party authority or create your own self-signed certificate.
Activate Office - Microsoft Support
Learn how to activate Microsoft 365 or a non-subscription version of Office on your device. Find troubleshooting tips for common activation errors and get help from guided support in your browser.
Unlicensed Product and activation errors in Office
Learn how to fix Unlicensed Product or Non-commercial use / Unlicensed Product errors in Office apps. Follow the steps to sign in, check for multiple copies, renew subscription, and troubleshoot activation issues.
Digital signatures and certificates - Microsoft Support
Learn how to use digital signatures to authenticate and protect digital documents in Office files. Find out what a digital signature is, how to get a signing certificate and certificate authority, and what assurances digital signatures provide.
Manage your Microsoft 365 subscription or Office product
Learn how to access and manage your Microsoft subscriptions or Office products in your Microsoft account dashboard. Sign in with your personal or work or school account and follow the steps to install, renew, cancel, or share your subscription.
Install and set up Office on an iPhone or iPad - Microsoft Support
Learn how to get Word, Excel, PowerPoint, and OneNote on your iOS device with a Microsoft account or a Microsoft 365 subscription. Follow the steps to sign in, add cloud services, and access premium features.
A subscription notice appears when I open a Microsoft 365 …
If you see a notice to buy, renew, or reactivate your Microsoft 365 subscription when you open Office, you need to take action to keep using Office. Learn how to enter a product key, check your renewal status, and restore full use to Office.
View, manage, and install add-ins for Excel, PowerPoint, and Word ...
Learn how to view, install, and change settings for add-ins that enhance Microsoft 365 programs with custom commands and features. Find out how to troubleshoot add-in issues, cancel subscriptions, and access add-in help.
Use the Speak text-to-speech feature to read text aloud
Learn how to use Speak, a built-in feature of Word, Outlook, PowerPoint, and OneNote, to have text read aloud in your language. Find out how to add Speak to the Quick Access Toolbar and how to use it with different text formats and languages.