Cannot create a mailbox store in a storage group

With Exchange 2000 server standard edition, I tried to create a second mailbox store in the first storage group, which has only the default mailbox and public stores. But I encountered an error " The storage group already contains the maximum number of stores allowed. Id no: c1034a7a  Exchange system manager. So I created a second storage group in order to create a new mailbox store. But I got the same error. There aren’t any stores in the second storage group at all. Please help!

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Exchange 2000 (or 2003) Standard edition is only allowed a single mailbox store and a single public folder store.  The only way to get the enhanced ability to have additional stores is to upgrade to the Enterprise Edition.
Additional note-
Here is a link from Microsoft regarding the error you received:

This Storage Group Already Contains the Maximum Number of Stores Allowed;EN-US;283283

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ccswpbAuthor Commented:
How about storage groups?  I learned from an education book that a maximum of four storage groups can be created on any exchange 2000 server. Is this right?  
Correct, you can create the storage groups.  What it will not allow is creation of additional mailbox stores.  I haven't tried this, but it might be possible to stand up an Exchange 2000 Standard server, remove the public folder store, and create an additional mailbox store.  (Obviously you would have to re-home the users to another public folder store since the server they are on would not have one).

Exchange 2000/2003 Enterprise Edition allows for up to 20 Stores.  Up to 4 Storage Groups can be created.  Up to 5 databases per Storage Group are supported.
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