Outlook’s slow add-ins resiliency logic and how to always enable slow add-ins

Overview This post explains how to deploy registry settings that would force Outlook to always load a specific add-in. The information in this post only applies to slow (VSTO) add-ins. If Outlook disables your add-in to prevent a crash, this blog post isn’t for you. Requirements Outlook 2013 or 2016. Information Outlook 2013 and 2016’s…

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Configuring and managing Outlook’s Autocomplete Cache

Overview Outlook cannot be configured for selective (criteria based) caching of entries in the autocomplete stream. In addition, individual entries cannot be removed by standard programmatic means. Individual entries can be removed manually using the Outlook client. More information The autocomplete stream is a set of recipient property rows that are saved as a binary…

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PowerShell: Deploying Outlook ribbon customisations

The Outlook ribbon can be customised by users, and any such changes are stored in an Xml file in the user’s AppData folder (by default, this will be %LocalAppData%\Microsoft\Office – though this can be changed to roaming AppData using a registry key).  Sometimes a company may want to have specific functionality (or custom functionality) available…


Certain Unicode characters are replaced with question marks for text properties set using UserProperties.Add

SYMPTOMS When trying to retrieve text UserProperty values via the Outlook Object Model from signed or encrypted messages, if the values contain extended Unicode characters, you will notice that certain characters are replaced by the question mark “?” symbol. For example, you use the following code to create a UserProperty object named myUserProperty. You then…

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Outlook add-in sample – implementing additional controls for capturing meeting notes

I’ve written a VSTO add-in sample that implements a form region with a rich text control that allows capturing rich text notes and additional information for appointments and meetings. How it works The add-in implements the form region displayed in the screenshot below for compose-mode meetings. Upon saving the appointment or meeting invite the content…

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