Error connecting to SQL server with MSSQL and PHP
$myServer = "sql2008";

//$myUser = "zach";
//$myPass = "pass";

//$myUser = "DOMAIN/zach";
//$myPass = "pass";

//$myUser = "zach@DOMAIN.net";
//$myPass = "pass";

$myUser = "sa";
$myPass = "pass";


$myDB = "Database";

//connection to the database
$dbhandle = mssql_connect($myServer, $myUser, $myPass)
or die("Couldn't connect to SQL Server on $myServer. Error: " . mssql_get_last_message());

Couldn't connect to SQL Server on sql2008. Error: Login failed for user 'zach@DOMAIN.net'.