I have VBA code samples to load templates and change the Sender address without going into Outlook's convoluted Template dialog but wanted a PowerShell version.
Insert Word Document into Email using VBA
How to use a macro to reply to senders by inserting the text from a Word document as the message text. There is also a macro to send a new message with the contents of a Word document inserted.
Warn Before Deleting a Contact
Use a VBA macro to warn before deleting (or moving) a contact in classic Outlook.
Use PowerShell to Delete Attachments
How to use PowerShell to delete large attachments from all messages in a classic Outlook folder or all attachments from selected messages in any classic Outlook folder.
Remove RE:, FWD:, and Other Prefixes from Subject Line
A VBA macro for classic Outlook to change the prefix on messages when the Reply and Forward prefixes are different, such as AW: instead of RE:. It can also be used to remove or change other prefixes, such as External:.
Change the Mailing Address Using PowerShell
How to use PowerShell to bulk change the Mailing Address selector (or move the address to a different address field) in classic Outlook's contacts.
Send an Email When You Open Outlook
Today's entry in the Fun with Programming series is a macro to send a message every day when you first open Outlook.
Open Outlook Folders using PowerShell or VBScript
How to use PowerShell or VBScript scripts to open an Outlook for Windows folder.
Delete Old Calendar Events using VBA
A VBA macro for classic Outlook to remove "clutter appointments", such as delivery notification, focus time, or other old events I don't need on my calendar.
Use PowerShell or VBA to get Outlook folder creation date
Use PowerShell or VBA to get the creation date of a folder in Outlook desktop software.