Problem with MSSQL query syntax vs. MYSQL query syntax

[lqqker lqqker]

Hello,
Can someone please tell me why the below query in MSSQL works but in MYSQL it gives me an error.

select distinct systems.ip from services inner join systems on services.ip = systems.ip where running like 'Microsoft%' and not exists(Select port from services where services.ip = systems.ip and port = 8081);

the error it comes back with is this.

ERROR 1064: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'exists(Select port from services where services.ip = systems.ip


Thanks in advance for any help you can give a newbie :-)