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Signing certificate and certificate authority. Signing certificate To create a digital signature, you need a signing certificate, which proves identity. When you send a digitally-signed macro or document, you also send your certificate and public key.
If you plan to exchange digitally-signed documents together with other people, and you want the recipients of your documents to be able to verify the authenticity of your digital signature, you can obtain a digital certificate from a reputable third-party certificate authority (CA).
If Office activation fails, you'll see Unlicensed Product or Non-commercial use / Unlicensed Product in the title bar of your Office apps, and most features of Office are disabled. To restore all features of Office, you'll need to fix the problem that's causing activation to fail.
To use Microsoft 365 on your new device, you can activate Microsoft 365 as a 1-month trial of Microsoft 365 Family. You can also buy Microsoft 365 or a non-subscription version of Office, add Microsoft 365 to an existing Microsoft 365 subscription, or enter a product key from a new product key card.
This message is often triggered by a problem with your Microsoft 365 subscription payment. For example, if your payment was declined due to an expired or cancelled credit card, your subscription may become expired or suspended.
Manage your Microsoft 365 subscription or Office product. You can manage all of your Microsoft subscriptions in your Microsoft account dashboard. Select each subscription to change when and how you pay, or to see order history & receipts. Choose your account type.
This article explains how to renew your Microsoft 365 subscription for personal or family use and what you can do after you renew. It also provides detailed troubleshooting help. If you need help managing your payment, see Add, update, or remove credit cards and other ways to pay.
If you've purchased Microsoft 365 Family, you can share your subscription benefits with up to five other people. For details, see Share your Microsoft 365 Family subscription.
Microsoft 365 Family subscribers can share subscription benefits with up to five other people in their family group by sending an email or copying & sharing a link. Important: Sharing is only possible if the invitee joins the subscription owners' family group.
You can add a signature line to a document, add a graphic of your handwritten signature, or save a signature block as an AutoText building block. For information on adding a digital signature, see Add or remove a digital signature in Office files.
On the Home tab, select Editor. In the Editor pane that appears, scroll down to Similarity and select Check for similarity. When the check is complete, Editor shows you how much of your content matches text that it found online (indicated as a percent), and the number of distinct passages in the document for you to review.