Total Item Size VS Total Mailbox Size

Question

Total Item Size 10.69GB VS Total Mailbox Size 56.92GB

Done 2 weeks of users mailbox archiving and start moving them to new database over weekend. Some of users when listing them are getting different Total Item Size and different Total Mailbox Size, above example is 40GB different. I run archive on this person, and yes cached settings in outlook are set to: Download email for the past: ALL. There is nothing else I can archive from this user mailbox and now its transferring 56.92GB across to new Exchange database.
It dosen't show as white space in database.

Any advice of what is it and how to get rid of that would be much appreciated.

Answer 1

Hi @Kamil Panfil ,

Welcome to our forum.

What is your version of Exchange?
According to my tests, got the same result as you:

Before moving the mailbox: TotalItemSize is 1.202MB

check the move request: TotalMailboxSize is 1.522MB

When the move is complete: TotalItemSize is 1.257MB

It is recommended that you review the mailbox size again after the move is complete.
In general, mailboxes that are normally moved are larger in size than before the move.
For more information, please refer to: mailbox-sizes-increase-dramatically-after-migration-to-exchange-2013

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Answer 2

Exchange 2013 ver.15

This is outlook folder size

and here is what I get checking by PowerShell - mailbox finished move to new database more than 24h

Is TotalDeletedItemSize are invisible files that users can restore directly from Outlook ?

How can I delete deleted ?

Answer 3

I think I found solution

YES that 46GB of data are deleted items that can be recovered by user.

This command will show what limits are set to user mailbox:
Get-Mailbox "michael" | Format-List Quota,RetainDeletedItemsFor,UseDatabaseRetentionDefaults

In my case it was set to unlimited

Run this to get user mailbox info
Get-MailboxFolderStatistics michael -FolderScope RecoverableItems | FL Name,FolderAndSubfolderSize,ItemsInFolderAndSubfolders

Run this to delete items in TotalDeletedItemSize for Michael
Search-Mailbox -Identity "michael" -SearchDumpsterOnly -DeleteContent

This will of course take some time, depend of how much data need to be removed.
And final figures of white space in Exchange database is something I was looking to achieve.

Above is how I done it. There are some checks that need to be done before. Make sure you have backup before you do anything. Above works for me, but might not work for you.