How to Create an Outlook Appointment using Nintex Workflow 2010

The ‘Create Appointment’ workflow action will call the exchange web service, pass in the credentials of a user that has write access to the target Outlook calendar, and add a new appointment to that calendar.

When I attempted to configure this, I was receiving an error in the SharePoint logs referring to “The root of the certificate chain is not a trusted root authority”.

You need to install the root certificates into ‘SharePoint Root Authority’.SharePoint out of the box only trusts its own self signed certificate called ‘local’.

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Nintex support provided a good PowerShell command which will add all the root certificates on the local machines into SharePoint.

foreach ($cert in (Get-ChildItem cert:LocalMachineRoot)) { if (!$cert.HasPrivateKey) {New-SPTrustedRootAuthority -Name $cert.Thumbprint -Certificate $cert } }

The next step is to ensure the configurable user credentials (source user) have write access to the calendar that will have the appointment added to it.

This can be done in one of two ways. The first is to have the target user provide the source user with write access to their calendar.

The second is through the Exchange Management Shell.

The first command can be used to confirm the changes have taken place as it will list all users associated with the respected calendar along with their permission levels.