The 5 possible Exchange 2007 server roles are:

Unified Messaging
Edge Transport
Client Access
Mailbox
Hub Transport

For an indepth look at these roles, click one of the Exchange 2007 roles above.

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The Exchange 2007 unified messaging role:

Merges Voice over IP with exchange 2007
Allows users to check voice mail through OWA (Outlook Web Access

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Exchange 2007 client access server is:

Provides OWA (Outlook Web Access)
Outlook mobile access

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The Exchange 2007 edge transport role contains:

Anti spam protection
Anti virus protection
When used email hits the edge transport before going to the hub transport server
Can not exist on a server with any other server role.  (IE: a Hub Transport and Edge Transport server can not exist on the same physical machine)
Installed on the edge of your [...]

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The Exchange 2007 Hub Transport role is:

Responsible for internal mail flow
Installed in Active Directory
Varies if you are using an edge transport server as well.

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The Exchange 2007 mailbox role provides and uses the following:

Holds Exchange databases
Hold mailboxes and public folders
Part of an Active Directory Domain
Requires plenty of space in Active Directory
Allows a maximum of 50 mail storage groups (in Exchange 2007 enterprise)
Allows maximum of 50 mail databases across all storage groups (in Exchange 2007 enterprise)

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This Power Shell cmdlet will show all of the mailbox sizes and their quotas.  It will also let you know if the mailbox has exceeded it’s quota and disabled as a result.  It outputs the username, the total item size (sorted highest to lowest), and their storage limit status.
Get-MailboxStatistics -Server SERVERNAME | Sort-Object -Property TotalItemSize [...]

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If you migrated from Exchange 2003 to Exchange 2007 and still have some residual mailboxes left behind on the old exchange 2003 server, this Power Shell cmdlet will be very useful to you.  It will list all users the old exchange 2003 server and their respective mailstores.
Get-Mailbox -OrganizationalUnit OUNAME -Server OLDSERVER | Format-List Alias, ServerLegacyDN
Where [...]

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Use this cmdlets to list all users on old server and their old mailstore
Replace “OUNAME” with one of your Organization Units
Replace “SERVERNAME” with your exchange 2003 server
Get-Mailbox -OrganizationalUnit OUNAME -Server SERVERNAME | Format-List Alias, ServerLegacyDN

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This script is perfect for moving a large amount of mailboxes from Exchange 2003 to Exchange 2007. To use this script, simply create a csv file and include “alias” as the first line in the csv file. Then include a list of users in that file. For example:
alias
user1alias
user2alias
user3alias
## Name: MoveMailboxes.ps1.
## Create a csv file with [...]

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