Before Microsoft App-V, we had MSA, which is still a great product. The disadvantage of MSA is that it is difficult to deploy compared to App-V. You need to perform an installation on the user's computer in a timeframe where the user is not there. Everything runs in the system account. You have conflicts with other apps because everything is locally installed, with MSA being the main installation engine, in MSA through SSCM. I believe that they are trying to put MSA X in place, which is not very good, but MSA would remain the main way to install applications.