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C:\suchverzeichnis\*\*

Beginning in Windows PowerShell 3.0, Select-Object includes an optimization feature that prevents commands from creating and processing objects that are not used. When you include a Select-Object command with the First or Index parameter in a command pipeline, Windows PowerShell stops the command that generates the objects as soon as the selected number of objects is generated, even when the command that generates the objects appears before the Select-Object command in the pipeline. To turn off this optimizing behavior, use the Wait parameter.

Get-ChildItem -Path \\server\c$\suchverzeichnis -Recurse -ErrorAction SilentlyContinue -Force  -Filter "server.log"  | Select-Object -First 1  

gci 'c:\suchverzeichnis\*\*' -recurse -Filter 'server.log' -Force  

function Find-FirstFile([string]$path,[string]$filter){
    $result = gci $path -Filter $filter -Force | select -First 1
    if ($result){
        return $result
    }else{
        gci $path | ?{$_.PSIsContainer} | %{Find-FirstFile $_.Fullname -Filter $filter}
    }
}

Find-FirstFile "C:\suchverzeichnis" "server.log"