Need help with powershell script

Hi I am using the following script to disable OWA for a list of users, how can I generate a result log file for actions like error warning and success while running this script?

I would like to get the following in log with respect to the result of command.

For each Successful operation print       - OWA disabled for user $username
For each Warning print             - OWA disabled for user $username with warning
For each Error print            - Not able to disable OWA for user $username

Thanks in advance.

$UserList = get-content userlist.txt

foreach ($Username in $UserList) `
{ 
set-casmailbox -identity $UserName `
-OWAEnabled $false `
-POPEnabled $false `
-ActiveSyncEnabled $false `
-ImapEnabled $false
}

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