Vista with OCS and access to Windows 2000

We are currently having a small conflict with our security set up at my work. Apparently for Windows Vista to access OCS 2007 we need

"1) Network security: Minimum session security for NTLM SSP based (including secure RPC) clients

2) Network security: Minimum session security for NTLM SSP based (including secure RPC) servers"

to require 128-bit encryption, and NTLMB2 Session security. These security features however apparently prevent us to access windows 2000 file servers, and NetApp appliances. Is there any work around for this problem where we can have both OCS 2007 and Windows 2000 accessible through Vista?