If the server name always ends in the last 4 chars as dc## then you could use something like:
$server=left(%logonserver%,-4)
use M:\ "\\" + $server + "fnp01\data"
A better way would be to use RegEx, but I am so weak in it, I could't begin to give you any advice on it.
Curious, how do you know for a fact that they will authenticate with the local dc? Maybe a local subnet lookup would be a better guide to location.
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(... better days ahead)
