Under 2.4.3 you could use the Market version (under VZW section) of Visual Voice Mail.
Under 2.5.6 you can load the Market Version, but when I try and run it I get an error that VVM already comes with my phone and I should use the version on my phone.
Problem is, the Fission ROM doesn't include the Moto supplied version (yes, I can grab a copy), but the Market version is newer and nicer looking.
What changed in 2.5.6 that let's VVM know that it's on a Droid2 and not to let the Market version run. The changelog states framework cleanup, but I'm not sure where to look in the framework file.