Exchange 5.5 and NT4 Sp6a

Anyone out there had problems upgrading an NT4 box at Sp4 running Exch 5.5
Sp2 to NT4Sp6a.

We recently done this on our servers and all the NT4Sp6a boxes could not
make external RPC connections. Exchange boxes still on NT4Sp4 could
connect OK to the Sp6a boxes, but not vice versa.

Any help or ideas gratefully recieved.


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