Anyone familar with RMX Services (a subsidiary of UPS)?

I found this among some used stamps and when looking up RMX Services on the internet, I came up with this explanation:
Global Management Services, LCC (commonly known as RMX), based in Reno, Nev., a new subsidiary of UPS, is helping customers save time and money while managing their flow of flats, which are pieces of mail that are larger than a letter but smaller than a parcel.
RMX sorts flats by ZIP code, ships them close to their intended destination, and drops them into the U.S. postal system. RMX saves 15 percent to 30 percent in cost over sending flats solely through the Postal Service and reduces transit hours, making delivery time for flats comparable to that of first-class mail.I never heard of it before. Is this something old or new?