Use add-ins in Outlook - Microsoft Support
Use an add-in while composing a message. Create a new message or reply to an existing one. From the ribbon, select the Message tab, then choose the add-in you want to use. If the add-in doesn’t appear in the ribbon, select Apps to view your installed add-ins.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook on the web, New Outlook for Windows, Outlook Web App
Recall an email message that you sent in Outlook
Recall a message in Outlook on the web. Select Sent Items in the left folder pane, then double-click the sent message to open it in a separate window. From the ribbon, select Recall Message, then select OK in the confirmation dialog box. Shortly thereafter, you'll receive a Message Recall Report in your inbox.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Microsoft 365 admin, Outlook on the web, Outlook.com, New Outlook for Windows
Install the Windows 8.1 Update (KB 2919355) - Microsoft Support
If you see any of the following Windows Update errors when you try to install the Windows 8.1 Update or Windows RT 8.1 Update ( KB 2919355 ), you might be able to fix the problems with these solutions. If you need more help, contact Microsoft support. Code 0x800F0922.