Function Get-ExchangeServerInSite {
    $ADSite = [System.DirectoryServices.ActiveDirectory.ActiveDirectorySite]
    $siteDN = $ADSite::GetComputerSite().GetDirectoryEntry().distinguishedName
    $configNC=([ADSI]"LDAP://RootDse").configurationNamingContext
    $search = new-object DirectoryServices.DirectorySearcher([ADSI]"LDAP://$configNC")
    $objectClass = "objectClass=msExchExchangeServer"
    $version = "versionNumber>=1937801568"
    $site = "msExchServerSite=$siteDN"
    $search.Filter = "(&($objectClass)($version)($site))"
    $search.PageSize=1000
    [void] $search.PropertiesToLoad.Add("name")
    [void] $search.PropertiesToLoad.Add("msexchcurrentserverroles")
    [void] $search.PropertiesToLoad.Add("networkaddress")
    $search.FindAll() | %{
        New-Object PSObject -Property @{
            Name = $_.Properties.name[0]
            FQDN = $_.Properties.networkaddress |
                %{if ($_ -match "ncacn_ip_tcp") {$_.split(":")[1]}}
            Roles = $_.Properties.msexchcurrentserverroles[0]
        }
    }
}

#add all servers in the local site to an array
$servers = New-Object System.Collections.ArrayList
Get-ExchangeServerInSite | %{ [void]$servers.Add(($_.fqdn)) }

#select a random server from the current site
if($servers.count -gt 1) {
    $random = Get-Random -Minimum 0 -Maximum $servers.count
    $fqdn = $servers[$random]
}
else {
    $fqdn = $servers[0]
}

#create the session
$session = New-PSSession -ConfigurationName Microsoft.Exchange `
-ConnectionUri "http://$fqdn/PowerShell/" -Authentication Kerberos

#import the session
Import-PSSession $session