I've always wanted to put this one together but none of my clients (since 2002 with version 1.0) have ever wanted to spend money for it - what does that say about it being a 'nice-to-have' instead of a 'must-have' requirement!!
This automation uses Flow to retrieve the latest currency rates from a public feed (thank you http://www.floatrates.com!!) and update those currencies set up within Dynamics 365. This flow provides the basics but certainly there is opportunity for improvement. Please do!
I recently wrote a Flow for a SMB that I was surprised was not otherwise widely available. The Flow checks for new Leads created through the corporate web site at 3 specific times every weekday and sends an email notification with the list of new Leads to the Sales Manager should one or more Leads are found.