Can I use 4 express 1 extreme?
I bought 1 extreme and 4 express but only 3 working toghter. Can I use 4 express+1extreme?
Windows 7
Apple says you can use up to six (6) Airport Express units.
AirPort Express frequently asked questions (FAQ)
You can send an AirTunes stream to multiple remote AirPort Express units .The maximum number of remote AirPort Express units is up to six. The actual number that will work in your environment will depend on conditions such as building composition and radio interference, distance to the remote AirPort Express units, and available network capacity relative to your other usage.