Wes, I'll track the message size limits setting you mentioned.
I'm not quite sure of the PowerShell question. Windows PowerShell itself is a separate release and I'm not going to speak for it. You can look at Windows PowerShell website for information. For Exchange, we are considering the Longhorn server support in a future release, and the Exchange Management Shell is built based on PowerShell.
For your situation copying a user, try to use param TemplateInstance for New-Mailbox to create a new mailbox. The new mailbox will be an exact duplicate of an existing mailbox, except a few mandatory settings which need to be specified. Such as:
New-Mailbox -TemplateInstance (Get-Mailbox <existingmailbox>)
Is this what you want? And for E2K7, we should not rely on ADSIEdit to edit something, if it cann't be done in cmdlets, please let us know.
For enabling or disabling attachments in OWA, we DO have the GUI. : ) Go to the console -> Server Configiration node -> Client Access subnode -> open the property dialog of owa (Default Web Site) vdir of Outlook Web Access tab -> see Public/Private Computer File Access page.
For the help information, besides the information available in the cmdline, please check out the Exchange Server Help doc which has more information.
Once again, thanks for the comments.