Are mainframe computers still necessary?

Related questions

1. Does IBM still make hardware?
2. Do mainframe computers still exist?
3. How many IBM Watson's are there?
4. What is the work of IBM?
5. Is IBM Bluemix free?
6. What are IBM mainframes used for?
7. Why is IBM Watson important?
8. Does IBM still sell mainframes?
9. What are supercomputers used for?
10. What does the IBM do?

Tags

1. #systems
2. #capable
3. #businesses
4. #mainframe
5. #mainframes
6. #using
7. #sized
8. #processing
9. #machine
10. #important
11. #refrigerator
12. #still
13. #telling
14. #brand
15. #because
16. #billion
17. #companies
18. #bought
19. #years
20. #decommission
21. #investing