Ok, so the Domain Controller I inherited has all of the following installed: 
I'm sure these were used at some point before, but presently we have a newer SQL server and I'm fairly sure either none of these are being used or only 1 or 2 of them are.
The server in question, our Domain Controller, is running SBS 2008. It serves 3 functions and 3 only
- DC logon Server
- Exchange Server
- Hosts our CompanyWeb intranet site (Sharepoint)
It does nothing else. Can I get rid of all these SQL installs? Or, preferably, how can I test to ensure they are no longer used? Thanks....