To count skype for business users

To count skype for business users in a Pool

PS C:\Users\admin> (Get-CsUser -Filter {RegistrarPool -ne "SFBPool.mydomain.com"}).count

2140

To count skype for business online users

PS C:\Users\admin> (Get-CsUser -Filter {hostingprovider -eq "sipfed.online.lync.com"}).count

2140

To count skype for business users

PS C:\Users\admin> (Get-CsUser).count

3633