Using Adsiedit to Increase User Mailbox Size Beyond 2GB on Exchange Server 2003

If you use Exchange 2003 (I’m not sure if the same applies to later versions), you may have noticed that you cannot set a user’s mailbox size to anything greater than 2097151KB (2GB).

The good news is that this limit is only GUI imposed (soft limit) and not a hard value fixed on the exchange server software it self (hard limit).

Increasing a user’s mailbox is really easy and safe – however, I don’t recommend that you configure the size to some unreasonable or extreme limit.
As always, a full backup of the mail store is recommended before changing any settings on the Exchange.

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