The tree has 2 servers (file/print with DS master replica and BM) both
running NW5.0 SP6a.
The BM version is 3.5 SP3 and the server has 4 interfaces, NAT, filters
and proxy implemented.

We are planning to migrate the FIle server to the new hardware and leave
the BM server and do an inplace upgrade. There is no option for a parallel
BM install.

I know that the current OS and DS versions are incompatible with BM 3.8.

Seems like that the gotcha here is how to upgrade BM 3.5 to 3.8 and at the
same time upgrade OS from NW5.0 to 6.5 on the BM server? An interim OS

What server should we upgrade first and what is the upgrade method for our
BM server in this situation ?

Any ideas, hints?
Thank you,