Yes, Personas 2 and Personas 3 co-exist quite happily alongside each other. Your Personas 3 installation should not affect your Personas 2 developments at all. Of course you should test to make sure, but mine are still running unchanged alongside their migrated Personas 3 equivalents.
I am not familiar with BASIS things. Our BASIS Team told me that if I want to have the Personas 3, it would be an "Upgrade of current Personas 2", instead of making a new Installation of Personas 3. Is that so?
"Upgrade of current Personas 2" sounds for me that Features of Personas 2 will be NOT available any more.
By the way, do you recommand for Personas 3 SP1 or SP2? Is SP2 a stable Version?
It is not an upgrade. Installing the Personas 3 add-in does not affect your existing Personas 2 installation. All of your Personas 2 developments should continue to run as before. Mine do. You can continue to support and even develop in Personas 2 if you wish - it really isn't affected at all by the installation of Personas 3.
You can take as long as you need to migrate or re-develop your flavours in Personas 3, and can even run Personas 2 flavours and their Personas 3 equivalents at the same time.
There is a separate process to remove Personas 2 from your system once you no longer need it. Until you do that, though, Personas 2 will continue running as it does now, unaware of the existence of Personas 3.
Personas 2.0 apps will be available in Personas 3.0 only thru migration or you have to build it from scratch in Personas 3.0. But as Steve said, both Personas 2.0 and 3.0 can run in parallel in your system.
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