I am usually an Oracle bod. This is why. I loaded up Documentum V 5.2.5 last week – more legacy reasons and I wanted to use SQL server. Installed SQL Server 2000 and SP4. All went well until the Documentum installer balked and told me it wanted a database that was case sensitive.
Holy tables – Not case sensitive – well of course windows isn’t. So I had to resinstall SQL Server with Case and Accent sensitive.. A waste of an hour of my life. Make sure you do it when the installer asks you when setting up.
Davy's Blog 
Most folks would argue case sensitivity in the exact opposite way…
Documentum is a fussy product as it has to work in the same way with DB2, Oracle, Sybase and SQL server – so I assume thats why it needs to be case sensitive.
However, I would have thought it quite good that you could search a value on a case sensitive basis – why would most folks think case insensitive is better ? Interesting…