I switched the order of ' and " and now it seems to work:
-command "New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri
http://yourexchangeserverFQDN/PowerShell/ -Authentication Kerberos; $s = Get-PSSession; Import-PSSession -Session $s; Get-MailboxStatistics -Server SERVERNAME | select-object DisplayName,TotalItemSize,
ItemCount,
StorageLim
itStatus | export-Csv 'T:\Rockbridge Network Documentation\50 Reporting\Email & Archiving\Monthly CSV File\data.csv'"
If it still does not work then try put the full path for the program:
c:\Windows\System32\Window
sPowerShel
l\v1.0\pow
ershell.ex
e