Exchange 2003 Private db maximum size

I have upgrade the store on my Exchange 2003 server and now have plenty full of space available. The Private store has right now a quota at 100mb for each users. I would like to raise it to 2-5gb PER user.
I am looking for the best practices and feasibility of that change of configuration.
Should I split my 200 users into 200 storage's groups. Keep all in the same storage group but create xx number of stores. Or would I need more then one Exchange server for this.
We need to consider also the feasibility in case of a database corruption.
If there are limitations, would Exchange 2010 have any advantages?

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Generally, the maximum size of the Exchange 2003 SP2 database is 75GB. Therefore you will need to have more than one DB in your scenario, which means you will have to create another stores and move users mailboxes accordingly between the stores to get the space required (calculate how many users can fit into one store based upon their particular mailbox sizes).
AmitIT ArchitectCommented:
Here are the best practice for Exchange 2003:

500 Users per DB MAX each size 200 MB only. DB should not grow above 100 GB. It is best practice, but it is not the limitation. Enterprise can grown up to 8TB.

Exchange 2010 would be the better option, as it comes up with an Archive feature, so you can keep Mailbox on one DB, with DAG and user can keep archive data in the archive server. Again all this require lot of planning and knowledge to implement. If you are new to Exchange, then you might need vendor support to implement it.

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SigSupportAuthor Commented:
The best practice part was relatively complete but the "feasibility" part and the best way to implement part was missing.

But it was usefull to begin with, tx!
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