You could certainly add a button to the document that would add an appointment item to Outlook. This has two potential issues you need to be aware of

1. It would require a macro and you cannot force users to allow macros in a document to run (and some security systems will not allow attachments that have macros).

2. Not all potential recipients of your newsletter will use Outlook.

My recommendation would be not to do this. Allow the recipients to make the decision whether they want to record details of your client's newsletter in their calendars.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com