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Mailbox bloating migrating from exchange 2000 > 2003

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by phil.carr

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We are in the process of moving from exchange 2000 to exchange 2003. So far we've moved 15 mailboxes using the 'move mailbox' wizard. All of them have increased in size which we expected because of the loss of SIS. However 3 of them increased by about 1/3 to 1/2 that's an increase of 200-300mb.

Is this kind of increase common? Is there any way of accurately predicting the increase in size due to losing SIS? Can this enormous increase be stopped?

Any help, thoughts or experience appreciated.

2 replies

by jswentworth

The space savings from SIS for each mailbox is directly related to how many internal emails are sent to multiple recipients in your org. If someone received thousands of internal emails that were nothing but pointers using SIS then when they lose SIS each of those pointers becomes a copy of that email. It's not really practical to determine. It's not uncommon in our org for Exch 2003 mailboxes to be 1.5gb and up. If I were you I would plan for a 50% increase across the board.

by phil.carr

Hi,

thanks very much for the reply - the explanation goes along nicely with some lab work I have been doing - the worst affected mailboxes are those who receive thousands of internal emails with attachments varying from a few 80k up to 26MB (I'm all for strict attachment size restrictions but that's a different story..).

An increase from 400mb to 1gb is probably what we will end up doing as we do have a lot more storage now.

Thanks again

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