Use the -RedirectStandardOutput
parameter to redirect the output to a file. Then, read the file contents back into your PowerShell sessions.
# 1. Get an alternate credential
$Cred = Get-Credential;
# 2. Start the process, redirecting the output to a file
Start-Process -Credential $Cred -FilePath ipconfig.exe -NoNewWindow -Wait -RedirectStandardOutput $env:windir\temp\ipconfig.log;
# 3. Retrieve the content from the log file
Get-Content -Path $env:windir\temp\ipconfig.log;