Office Add-ins

Action required: Update your Office add-in dialog for cross-domain communication

Ricky Kirkham August 27, 2021 Aug 27, 2021 08/27/21

We have recently implemented a security update to the Office add-in Dialog API that affects cross-domain communication between the dialog and the parent page (typically a task pane) using either the Office.ui.messageParent or Office.dialog.messageChild methods. Cross-domain communication means that your add-in calls one of these methods when ...

What’s new in Office Platform at Build 2021

Microsoft Office team May 26, 2021 May 26, 2021 05/26/21

Welcome to Build 2021! We are excited to share six new Outlook and Excel announcements that we think are particularly exciting for our Office developer community. These new features will help bring your business solutions more seamlessly into Office. For more detail, please see the Outlook and Excel on-demand sessions at Build. New event-...

What’s New for the Microsoft 365 Developer | Build 2021

Microsoft Office team May 25, 2021 May 25, 2021 05/25/21

It’s opening day at Microsoft Build 2021 and we’re so excited to be here (digitally) together with you again! The last 12-months have been challenging, as we collectively shifted to the unchartered territory of remote work to now the future of hybrid work. Throughout this disruption, developers have been leading the charge by building ...

Understanding the Office Add-ins runtime

Microsoft Office team May 5, 2021 May 5, 2021 05/5/21

Office Add-ins require a runtime environment to execute. Think of a runtime as the execution environment for the add-in that's a combination of a JavaScript engine and an HTML rendering control. A runtime can be encapsulated in a browser iFrame or an embeddable webview control on desktop clients. Since Office is a cross-platform suite, it ...

Letsignit leverages the Outlook Add-ins Platform to manage email signatures

Microsoft Office team December 4, 2020 Dec 4, 2020 12/4/20

Today we'd like to introduce you to Sébastien Telouk who is the Vice President of Sales at Letsignit, an email signature management solution for Microsoft 365. He sat down with us to chat about how Letsignit has leveraged the power of Outlook Add-ins to bring their email signature management system to life. Tell us about Letsignit ...

Mailbox 1.9 JavaScript API is Generally Available

Microsoft Office team October 26, 2020 Oct 26, 2020 10/26/20

Have you ever sent a mail, but forgot some essential disclaimer or text that needed to be in the message? With the append-on-send feature in the Mailbox 1.9 API, you’ll never have to worry about this again. You can programmatically ensure that what needs to be in a message is included as the mail is sent. This could be plain text, or even ...

Announcing WebView2 for Office Add-ins Platform – Preview

Microsoft Office team August 12, 2020 Aug 12, 2020 08/12/20

We're excited to announce that we're taking the next steps in evolving the web viewer control used by the Office Add-ins platform for add-ins running on Windows. Beginning with Office version 16.0.13127.20082 in the Office Insider builds, Office Add-ins running on Office 365 for Windows will use the new Chromium based Edge WebView2 as the ...

Microsoft 365 Developer Blog

Office Add-ins - Microsoft 365 Developer Blog