hi,

can i able to install two versions of sql server i.e. 2008 R2 and 2012 ?

thanks

Its possible

You can add one version as a default instance and other one side by side as a named instance.

I've three versions existing on my work machine 2005,2008 R2 and 2012

hi,

can i able to install two versions of sql server i.e. 2008 R2 and 2012 ?

thanks

The answer should be yes and you should have different DB instances to different SS versions.

Having multiple versions in a development environment is fine but you should be cognizant of adverse implications in a production environment because of shared components between the different