It would be nice to be able to track customer anniversary date, not having the option to easily visually identify the customer anniversary date, the user may have to inquiry on the first customer purchase.

Having the option to easily default customer anniversary date at point of first purchase transaction (customer sales order invoice), the user may future be able to easily list customer anniversary dates.

Having the anniversary date functionality, the user may future be able to compose promotions, complementary gift, sale reminders, customer anniversary events, special pricing, etc...