This is simply a case of the Software Compatibility Matrix showing UCCE 8.x because that was all they had confirmed at the time to have passed all compatibility tests. The latest I have is Sept 28 and the SR2 for 4.3(1) was released on Sept 24th, so all they had absolutely verified was UCCE 8.x
I have the SR2 running in the lab system with 7.2(7), and it will surely be compatible with 7.5(9).
Ask Cisco for confirmation, but it won't be restricted to UCCE 8.x. They will update the Guide.
However given time and cost constraints for the project, unfortunately we might have to go with 4.3(1) and consider a upgrade later.
In that case, you can apply ES4 (going from memory, so I hope this is the right ES) to 4.3(1) as this supports agents using IE8. That was its main purpose because there was a little delay in bringing out SR2 and customers wanted the IE8 support. That said, SR2 has a host of bug fixes. SR2 will complain if someone on IE6 tries to use the Agent Desktop, while ES4 will not,
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...