I'm sure the answer for this question is in this forum, but I can't find it:

Our system was set up in 2015 and includes many products that only work with S1, eg: Connect, Connect: amp, Play 1, etc.  My wife bought a Move and liked it so much she bought another, although unfortunately this time a Move:2.  Am I correct that it is not possible to connect a Move:2 to a system using S1?  If so, it's irresonsible that Sonos does not make that distinction clearer on its website, especailly for customers who may not be aware that 2 operating systems exist.