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How to compress exchange 2003 store without much disruption

I would like to compress the exchange 2003 mailstore without causing too much disruptions of mailflow to and from the Exchange 2010 server. What is the least disruptive approach based on my setup?

I have an exchange 2003 server and a Exchange 2010 server. The mail 2003 server is the SMTP server, the 2010 server is basically the mailbox server.  The main reason why I have to keep the exchange 2003 server is to to do restores onfold 2003 accounts that were closed and deleted.

All mailboxes except a few were transferred from exchange 2003 to Exchange 2010. The remaining mailboxes are tiny (less than 300K each.)

The remaining mailboxes are;

1 - The three exchange 2003 system mailboxes
2 - The network administrator
3 - A Backup Exec administrator account for the BE server that is used to back up the exchange 2003 box
4 - The 2003 exhcange administrator account

pri1.ebd is 37,099,080
priv1.stm is 30,584.840
pub1.ebd is 6,152
pub1.stm is 233,480

Most of the  2003 mailstore is deleted whitespace., I doubt that more that 1600K is used for e-mail messages. How do I compress it with disrupting mail flow for a long time?
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masterofall
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masterofall
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2 Solutions
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Only way to get the space back is if Enterprise create New Database and move mailbox .... if Standard then Dismount database and Offline Defrag

if you dont want to do Offline Defrag no other way to retain White\Free space ...... this wont be long but cant assure

- Rancy
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masterofallAuthor Commented:
It's exchange 2003 standard .  I don't believe that there is anything new going into those remaining 2003 mailboxes that I need. I am going to try the offline defrag to a new database to see how long it takes.
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masterofallAuthor Commented:
It's done and its all good. I dismounted the exchange 2003 store and copied the files before trying the defrag. The copy took a long time but duting that time I was able to send and received external mail using the exchange 2010 server. The defrag of the exchange 2003 store to a new database was very fast. It took about 4 minutes to produce the new database. I renamed the files and mounted the store.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Perfect so all is fine .... yes Exchange 2010 users would never be affected by any activity on this database as they all reside on 2010 Database\Server.

As things are working and taken care of and nothing else, we should resolve the post

- Rancy
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masterofallAuthor Commented:
I  would not have had any reservations had I known that the routing through the exchange 2003 server still work while the store was dismounted and there fore would not affect the mail traffic to and from the exchange 2010 server.
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