I have a Mitel SX 200 Superswitch - manufactured 12/83 9110 Analoge Series .

For years we ran KeyVoice voicemail for our hotel.

The PC based program's hard drive failed last week.

I am looking for a recommendation of a replacement VM system that will work with this unit.

The best recommendation I could give you would be to seek the advice of whatever tech is supporting your system. Making voicemail work on an analog SX200 isn't a job for the faint of heart or the DIYer.

Why not just replace the hard drive and reload the software? You could even run it from a compact flash if desired.