move mailbox between stotage group

hi, becuse of low disk space on my exchange server ,i decided to open a new storage group and direct it to be in drive d insted of drive c ,i started to move mailbox to the new storage group but every mailbox i move allso reduce the size of my c drive

why?and what can i do to fix it
server 2008
exchange 2007
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The shadow copy service may be storing recovery data on the C drive.
ywainbergAuthor Commented:
the shadow copy in not enable on drive c only on drive d
If you move a 10gb mailbox from the storage group on the C:\ drive to the D:\ drive, the available storage on the C:\ drive will not increase by 10gb.  Exchange will mark the space within the Exchange database as 'white space' for use later.  The only way to recover the physical disk space after moving mailboxes would be to run an offline information store defragmentation.
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ywainbergAuthor Commented:
why do i need "white space"? how do i run an "offline information store defragmentation"? and if the deframentaion is safe?
thanks for the quick replay
If you have 10gb of 'white space' in your Exchange information store, then Exchange will use this space before it starts to use physical disk space.

To run an offline defragmentation, you use the command 'eseutil /d {database name}'.  Here is a brief summary of the process: -

1. Take a full backup of your Exchange system.
2. Dismount the Exchange information store you want to defragment
3. Run eseutil /d {database name}
4. When it's finished, remount the Exchange information store.

You do need to have 110% of the size of yuor Exchange information store that you are defragementing.  For example, if your information store is 100gb in size, you will need 110gb to perform the defragmentation.

As for is it safe - provided you take the usual precautions, perfectly safe.

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ywainbergAuthor Commented:
when i am doing it no user will have access to his mailbox right?
my backup system went down today(all problem come in pairs...) so ill do it when i can do a full backup and will inform you fot the result
correct - all users that are on the information store that you are defragmenting will not be able to access e-mail.

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