Public Folder To Mailbox Map Generator maximum mailbox size

Hello,
I am in the planning stages of a 2010 to 2013 public folder migration.
Upon running the following script to generate the mailbox mappings in 2013 I receive the following error regarding the maximum mailbox size requested.
[PS] C:\Program Files\Microsoft\Exchange Server\V15\scripts>.\PublicFolderToMailboxMapGenerator.ps1 5120MB E:\Migration\
PublicFolders\PFMapNameToSize.csv E:\Migration\PublicFolders\PFMapFolderToMailbox.csv
[25/11/2014 11:32:08] Reading public folder list...
[25/11/2014 11:32:08] Loading folder hierarchy...
[25/11/2014 11:32:08] The size of the folder @{FolderName=\IPM_SUBTREE\Company\Admin Team\Info; FolderSize=174
62349238} (17462349238) is greater than the mailbox size 5368709120
[25/11/2014 11:32:08] Unable to load public folders...
I want to set the maximum mailbox size to 5GB, however it seems that this is not possible given that some of the existing folders exceed the maximum mailbox size specified.
I have increased the mailbox size gradually until there are no errors reported, but this leaves me with a maximum mailbox size of 50GB which is not what I require.
There is circa 45 GB of data in the PF hierarcy currently, with the largest folder containing around 42 GB of data.
I thought the idea was that the mapping generator would split the public folder data up and distribute it across multiple mailboxes as required?
Can anyone assist with achieving this please?
Regards
Matt

Hi Belinda,
Thanks for the reply. I've done some more investigating, as I thought the public folders sizes being reported were larger than expected.
Upon running the Get-PublicFolderStatistics cmdlet across the public folder hierarchy I can indeed see that the largest public folder we have is only 4.46GB in size, not the 42GB being reported by the generator.
PublicFolderToMailboxMapGenerator
[PS] C:\Program Files\Microsoft\Exchange Server\V15\scripts>.\PublicFolderToMailboxMapGenerator.ps1 25600MB E:\Migration
\PublicFolders\PFMapNameToSize.csv E:\Migration\PublicFolders\PFMapFolderToMailbox.csv
[25/11/2014 11:40:10] Reading public folder list...
[25/11/2014 11:40:10] Loading folder hierarchy...
[25/11/2014 11:40:10] The size of the folder @{FolderName=\IPM_SUBTREE\Company\Dept\SubDept Inbox\Offers; FolderSize=45160928457} (45160928457) is greater than the mailbox size 26843545600
[25/11/2014 11:40:10] Unable to load public folders...
Get-PublicFolderStatistics
Name ItemCount TotalItemSize LastUserAccessTime LastAccessTime FolderPath Offers 4314 4.46 GB (4,788,856,098 bytes) 25/11/2014 11:41 26/11/2014 08:14 Company\Dept\SubDept Inbox\Offers
Going back a step - before running the PublicFolderToMailboxMapGenerator.ps1
, the issue is initially occurs when running the Export-PublicFolderStatistics.ps1 as this is where the folder sizes are calculated and output to the PFMapNameToSize.csv. This is where the folder size is inflated by 10 times!
Is this a bug?
Does anyone know how to change this behaviour?
Regards
Matt

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