Hi,
Can you specify what is the "some delete function" that does not work?
Are you sure that this missing functionality will be addressed by the application of SP7 ?
SP7 has it's own set of "speed bumps" and I am told that these will be remediated with the soon-to-be-released Incremental.
The Agents can be upgraded separately, as can be the Client software.
They are backward compatible, though you should verify this via the Compatibility Matrix.
Good Luck!
Chris <CJ>