SexySi,

The biggest gotcha you would have faced would be if you were to jump the BIOS and Drac to the most current. With those 2 devices if you jump alot of updates at once, you can actually make the server fail to boot. So it is a good thing you asked as both the BIOS and Drac are several updates back.

With those I would suggest is walking them up in updates together, as an up to date iDrac may not communicate with an out of date BIOS.

I would suggest running a BIOS, then a iDrac update, then repeat like that till current. 

Here is a list of the updates need, from oldest (first to run) to the most current (last to run).

BIOS's

6.1.0 - http://dell.to/1L3hR27

6.2.3 - http://dell.to/1L3hVPr

6.3.0 - http://dell.to/1MsCKB5

6.4.0 (current) - http://dell.to/1Ix33oQ

iDrac

3.33 - http://dell.to/1dyVm6T

3.40 - http://dell.to/1KsXo5B

3.50 - http://dell.to/1FLG0DF

3.60 - http://dell.to/1MsEfiP                                                                                                                                         

3.65 (current) - http://dell.to/1B5q4Qb

Remember to alternate updates back and forth to keep them together in updating. 

You will also need to update the lifecycle controller.

Once you have those primary devices updated you can then run the Server Update Utility (SUU) to update the remaining system.

Thanks excellent reply, I have just found out we also have another domain controller on a R210, which again is well out of date, will dig out the versions that is currently running.

Thanks Si