Powershell Export-CSV Access to the path \\servername\sharename is Denied

Hi I'm new to PowerShell and I've been attempting to migrate an Exchange 2010 SP3 Public folder to Exchange 2013. I'm following the directions found athttp://technet.microsoft.com/en-us/library/jj150486(v=exchg.150).aspx .

I have gotten to Step 3 .\Export-PublicFolderStatistics.ps1 <Folder to size map path> <FQDN of source server>

It runs the command but when it attempts to write the CSV to the drive I get:

Export-csv : Access to the path '\\servername\sharename' is denied

I am running the Exchange PowerShell in Administrator mode

Within File Manager I have given:

the share Everyone Full permissions

NTFS Full permissions to:

Everyone, Domain Admins, Domain Users, Exchange Servers, Exchange Organization Admins,

PS] C:\Windows\system32>C:\ps_scripts\Export-PublicFolderStatistics.ps1 "\\server\sharename" server.domain.local
[11/21/2013 9:59:42 AM] Enumerating folders under NON_IPM_SUBTREE...
[11/21/2013 9:59:50 AM] Enumerating folders under NON_IPM_SUBTREE completed...25 folders found.
[11/21/2013 9:59:51 AM] Retrieving statistics from server SERVER
[11/21/2013 9:59:52 AM] Retrieving statistics from server SERVER complete...45 folders found.
[11/21/2013 9:59:52 AM] Total unique folders found : 45.
[11/21/2013 9:59:52 AM] Exporting statistics for 45 folders
[11/21/2013 9:59:52 AM] Exporting folders to a CSV file
Export-CSV : Access to the path '\server\sharename' is denied.
At C:\ps_scripts\Export-PublicFolderStatistics.ps1:221 char:70
+ $script:ExportFolders | Sort-Object -Property FolderName | Export-CSV <<<<  -Path $ExportFile -Force -NoTypeInformati
on -Encoding "Unicode";
    + CategoryInfo          : OpenError: (:) [Export-Csv], UnauthorizedAccessException
    + FullyQualifiedErrorId : FileOpenFailure,Microsoft.PowerShell.Commands.ExportCsvCommand

[PS] C:\Windows\system32>