Q: Is there a specific email message template for reorders?
A: Re-orders are handled the same as new orders, therefore the email message templates "order paid - store owner" and "order placed" will be used (if enabled).
Q: Do store owners / admins receive a specific reorder notification / email (message template)?
A: If you have the email message template "order paid - store owner" enabled, then that will be sent to notify you of a new order. There won't be any indication that this is a re-order.
Q: Do re-order reference the order / job ID from the previous order?
A: No, they are treated like an entirely separate, new order.
Q: Can I re-order from any point in time?
A: There are limits on re-orders in Order Settings - "limit re-orders to order placed within x days". This is typically around 1 year.
Q: If I update a product will a user be able to re-order it?
A: Probably not... in most cases they will get an error when trying to re-order. This is because after a product is updated / changed (for example the attributes) they will need to address any changes (for example complete the new attribute information).
Q: Where do I find the re-order option?
A: On the front end (the public facing storefront) to go My Account > Orders > expand Order Details > and you should see the re-order button.