Hello Peter,
This is not a requirement. You can link against the Microsoft static or dynamic runtimes, independently of how you link against the IPP library files (i.e., you can mix the link modes).
This can be a little confusing if you are using the Visual Studio GUI to enable IPP. In this case the/MD and /MT options will be used to decide if the IPP libraries should also be linked statically or dynamically. This is a broad assumption made by the Visual Studio GUI-based configurationtool -- you don't have to do it this way-- but the tool assumes that if you link the Microsoft libraries using /MD you also want to link dynamically with the IPP libraries, etc.
There is nothing in the IPP libraries that requires that link dynamically with the Microsoft runtime libraries.
Hope that's clear as mud!
Paul