Hi All,

I just migrated a 2.2 GB mailbox  with 50k item count from Exchange 2010 to Exchange 2007 sp3. After migration the mailbox is 3.7 GB in size with 70k items.

Can anyone shed any light on this. there is no way the user got 20k mails during the move.

Thanks

• Moved by Jason Johnston [MSFT]Microsoft employee Wednesday, February 11, 2015 2:45 PM Migration question

Hi ,

Please use the below mentioned command to check the which folder size has been increased abnormally after migration.

Get-MailboxFolderStatistics -Identity "nithya@abc.com" | ft name,foldersize,*item* -au

thanks for getting back to me. what does the -au parameter do?

output below

[PS] C:\Windows\system32>Get-MailboxStatistics XXX@XX.com |
ft name,foldersize,*item* -au

WARNING: column "TotalItemSize" does not fit into the display and was removed.

name foldersize AssociatedItemCount    DeletedItemCount   ItemCount    TotalDeletedItem
                                                                                                          Size
---- ---------- -------------------            ----------------            ---------     ----------------
                                318                             0                      72987       1000B

Hello, 

This is by design.  Exchange changed the way they calculate the size of the mailbox.  The amount of space the consumed by the mailbox in the Database has not actually changed, just the size Exchange calculates the size.

http://www.msexchange.org/kbase/ExchangeServerTips/ExchangeServer2013/TransitioningMigration/mailbox-size-increases-when-transitioning-exchange-2013.html

this is for 2013. i am migrating a mailbox from 2010 to 2007.

woops... sorry I thought I read 2013.. Might be something along the same lines. you may want to ask your question again in the Previous versions of Exchange Forum (this one is mostly for 2013).  Chances are you'll get a better answer there.

https://social.technet.microsoft.com/Forums/exchange/en-US/home?forum=exchangesvrdeploylegacy

Any way, just curious, any particular reason you are moving them back to 2007?

Hi,

You can use the following command, it will display all columns.

Get-MailboxFolderStatistics -Identity "nithya@abc.com" | ft name,foldersize,*item*

Please check and find the folder, the size and item of this folder increase abnormally, as what S.Nithyanandham mentioned.

You can check the folders in Outlook and see what kind of items are added after migration.

Best regards,

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