Typical legacy systems have been in existence for more than two decades.
This approach may not be available as an addition to a legacy system.
However, the bank encourages its employees to leave all their old email and data in those legacy systems.
There are still legacy systems in place using this technology.
The legacy system may or may not remain in use.
They have to get their legacy systems to talk to the Internet.
Several very different approaches were used to solve the Year 2000 problem in legacy systems.
The reason for this are compatibility issues with legacy systems.
Sometimes they are used to talk to legacy systems.
Any account more than a couple of years old is on some legacy system that acts like a black hole.