is there a special reason why the outdoor APs have only 1 year warranty and all other APs come with "Ltd. Lifetime Warranty with express Advanced Hardware Replacement-2" ?
This is typical. Cisco does the same. I can only assume it is because of the harsh conditions. Our failure for extremes outdoor APs compared to Cisco was initial very high. After further inspection I had the extreme partner come back onsite to grounds the APs correctly. Once this was done I probably lose 1 extreme AP a month. We have just over 200 installed at my facility.