How to get a list of ActiveSync users and devices from command line.

$mbx=get-mailbox

$mbx | foreach {$name = $_.name; $alias = $_.alias; $device = get-activesyncdevicestatistics -mailbox $_.identity; $device | foreach {write-output "$alias;$name;$($_.devicefriendlyname);$($_.deviceid);$($_.LastSuccessSync)"} } >list.txt

This is the output. One line for each mobile device.

smithb;Smith, Bob;iPad Air;Appl345SDFGDFG;06/06/2017 16:05:01

smithb;Smith, bob;iPhone 7;SDFGD987938798;06/05/2017 16:06:00

...

How to get list of ActiveSync users from the Exchange command line.

This will provide a simple list like below.

Get-ActiveSyncDevice | select UserDisplayName, devicetype

example.com/ou/Smith, Bob       iPhone

example.com/ou/Smith, John     Android

example.com/ou/Smith, Kelly     SAMSUNGMG955U