And speaking about Online Services, Microsoft has just released an updated version of the Online Services Migration Tools (v9.1).
Brief Description
Use this tool to support migration of Microsoft Exchange to Microsoft Online Services.
Overview
Use the Microsoft Online Services Migration Tools to forward copies of your Exchange Server mail to your Exchange Online mailboxes. You can also use the Migration Tools to copy content from your Exchange Server, POP3, or IMAP4 e-mail server mailboxes to your Exchange Online mailboxes. This product intended for use with Microsoft Online Services only.
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