Missing public folders in get-publicfolderstatistics result.

In prepare to migrate our Exchange 2010 to O365, I am trying some Exchange 2010 powershell commands to list our public folders.  I need to display the "last access time" and "who access it" of all the public folders and the sub-folders.  

The get-publicfolderstatistics result has missing public folders in the Public Folder Management Console, such as EX:/o=mydomain/ou=Exchange Administr...., internal, exchageV1, OAB Version 2, 3a, 4.  Do you think these folder are from older version of Exchange?

How can I display those missing folders in the command and is it possible to display both the "last access time" and "who access the folders?"

The "get-publicfolder -recurse -resultsize unlimited" command seems to show all folders and sub-folders in our environment.  How can I use it with the above command to display the result I need?

I use this reference link: https://technet.microsoft.com/en-us/library/aa997949(v=exchg.150).aspx

Thanks.
nav2567Asked:
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Adam BrownSr Solutions ArchitectCommented:
Pipe the get-publicfolder cmdlet to get-publicfolderstatistics. The oab and other folders are in the non-ipm-subtree part of the public folder structure, so running just get-publicfolderstatistics won't read them. You pipe the results of powershell cmdlets by using the | key, like this:
get-publicfolder -recurse -resultsize unlimited | get-publicfolderstatistics

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nav2567Author Commented:
I still see a lot of errors like this:

Couldn't find public folder "\W/N\b-charters1\simo" on server "myserver.mydomain.com".
    + CategoryInfo          : InvalidData: (\W/N\b-charters1\simo:PublicFolderIdParameter) [Get-PublicFolderStatistics
   ], InvalidOperationException
    + FullyQualifiedErrorId : 7132D31B,Microsoft.Exchange.Management.MapiTasks.GetPublicFolderStatistics

I think this is related to the missing folder in the get-publicfolderstatistics result.  Again, the missing folders (for example, W/M) are being shown in Public Folder Management in EMC.

Thanks.
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