rev4062 - add embedded database support to product using SQL Server:
1a) add SQLServerDatabaseType and override dbutils Column, Table, DataSet and XmlDataSet class as needed by T-SQL syntax;
1b) add T-SQL data type mappings in db-typemaps.xml; 
2) support SQL Server-specific helper methods to DatabaseTypeFactory and PersistenceUtility for ;
3) change rhq-container.build.xml to support SQL Server datasource (with snapshot isolation) and JMS backends;
4a) fix (or add new) native queries as necessary to support T-SQL syntax;
4b) extend logic in several SLSBs that switch on DatabaseType for various native sql solutions;
5) include default SQL Server configuration to /etc/m2/settings.xml using JTDS; 
6) change ALL domain entities in the project to use GeneratorType.AUTO (which default to identity strategy for SQL Server and sequence for Oracle/Postgres); 

note, this support is currently experimental.  since sql server doesn't support MVCC, you must alter the database to use read committed with row versioning (a feature that became available in sql server 2005)

ALTER DATABASE rhq SET READ_COMMITTED_SNAPSHOT ON

unfortunately, this doesn't solve all issues.  given the set of SLSBs we have today, we still have a few hot spots in the application where transaction size and/or duration cause some locking issues.  

note: i haven't seen any locking issues with measurement and/or availability reporting yet.

svn rev4065 adds support for ms sql server to the installer

rev4168 - add support for SQL Server 2008; 
drop isolation level to read committed (w/row versioning) instead of snapshot isolation; 

The installer supports ms sql server option. r4181

This bug was previously known as http://jira.rhq-project.org/browse/RHQ-2142
This bug is related to RHQ-2116
This bug is related to RHQ-2208
This bug relates to RHQ-2175