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You can use a mailbox item's custom properties to share information between a compose panel and an on-send script.
Outlook Add-in Compose Panel and On-Send Event
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(92.8, 62%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECR%3C/text%3E%3C/svg%3E)
Corey Roach
21
Reputation points
I am creating an add-in for Outlook in compose mode. I would also like to have this panel inform the on-send validation.
Is it possible to either allow the two (compose panel and on-send script) to communicate or share a context, or have the compose panel handle the on-send event and validation?
In a browser, I am able to use window.sessionStorage to share data. But, this will not work with Outlook on desktop. I also looked at using office.SessionData, but this is still in beta and disabled.
Microsoft 365 and Office | Development | Other
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(281.6, 84%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJL%3C/text%3E%3C/svg%3E)
Jade Liang-MSFT 9,986 Reputation points Microsoft Employee2021-08-05T05:17:06.437+00:00 Hi @Corey Roach ,
Please kindly understand under Outlook tag, we mainly focus on general issues about Outlook desktop client. Considering that your issue may be more related to add-ins development, I would add office-addins-dev tag under your post to solve it better. Thanks for your understanding and hope your issue would be resolved soon.
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Accepted answer
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(48, 37%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENJ%3C/text%3E%3C/svg%3E)
Neville Jones 76 Reputation points2021-08-10T23:53:38.39+00:00 -
Corey Roach 21 Reputation points
2021-08-13T19:08:29.547+00:00 That works well. Thank you!
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