MS SQL Select distinct

Hello,

I have following table with data.

service_id  service_start           service_end             updated_by last_updated
----------- ----------------------- ----------------------- ---------- -----------------------
1           2010-06-30 00:00:00.000 2010-06-30 00:00:00.000 test       2010-06-09 14:45:31.367
2           2010-06-30 00:00:00.000 2010-06-30 00:00:00.000 test       2010-06-09 14:47:17.163
3           2010-07-31 00:00:00.000 2010-07-31 00:00:00.000 test       2010-06-09 14:49:16.210
4           2010-07-01 00:00:00.000 2010-07-01 00:00:00.000 test       2010-06-09 14:49:16.210
6           2010-07-01 00:00:00.000 2010-07-01 00:00:00.000 test       2010-06-10 14:49:16.210
7           2010-07-31 00:00:00.000 2010-07-31 00:00:00.000 test       2010-06-09 14:53:16.210

I would like to select distinct service_start with latest update. So when I do a select it should look like

service_id  service_start           service_end             updated_by last_updated
----------- ----------------------- ----------------------- ---------- -----------------------
2           2010-06-30 00:00:00.000 2010-06-30 00:00:00.000 test       2010-06-09 14:47:17.163
6           2010-07-01 00:00:00.000 2010-07-01 00:00:00.000 test       2010-06-10 14:49:16.210
7           2010-07-31 00:00:00.000 2010-07-31 00:00:00.000 test       2010-06-09 14:53:16.210

When I tried a query "Select DISTINCT service_id, service_start, service_end, updated_by, last_updated from services order by last_updated desc" gives me all the records.

Thanks for help in advance.