the easiest way is to simply look at your service books. if you do not have a Desktop [IPPP] entry, then you do not have MDS. if you do, then you do
you can also simply cradle your BB and it should download OTA to your handheld if its enabled for your user account.
also, keep in mind that they may have MDS enabled for the server but not for your particular user account. i have MDS enabled on our server, but i've only enabled it for 3 total users.