The MSI Primo 81 is supplied with a vanilla version of Android Jelly Bean (4.2.2) which is quite recent. MSI pre-install a few apps on the tablet, though, some of which could come in useful.
These include ES File Explorer and ES Task Manager which will help you keep control of your files and applications. We ended up removing 4KPlayer, though, replacing it with the superior VLC Media Player.
The MSI Primo 81 has an unusual storage configuration which consists of a 1 GB module for the operating system and 16 GB of on-board storage. There was, however, only around 11 GB of usable space available when we received the tablet. This should be plenty for most users, however there is a Micro-SD card slot should you want to expand the memory.
MSI haven’t customised the browser at all, however the standard Android interface is very intuitive. We would recommend installing Chrome, though, as it offers a superior experience.
The on-screen keyboard is also a standard Android affair, however there are plenty of other keyboard styles available on the Google Play Store should this not be to your taste.