SOA - What Internal Web Service Did Your Company Implement First? [closed]

Question

What internal web service did your company implement first? What did you learn?

Answer 1

One of the first movers was the "Customer base system".

The common authority for all customers in the company.

EDIT:
regarding the comment:
It did indeed open up for more SOA. It's about 3-5years ago (before me) and currently it was publicly known last year that the SOA helped the company switch from a 3years delayed system to a new one within a year.

Regarding other stuff:
Dont get me started on our SAP integration :S Thats 3 years old as well, and nobody is really able to debug or update the setup. Currently we are POCing webservice integration with SAP. Pheeew