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Please refer below link this might be help you out.<br />
<br />
<a href="http://social.technet.microsoft.com/Forums/en-US/onlineservicesmigrationandcoexistence/thread/c6513ef5-149d-40f4-a0b7-8a7df9ed6205" rel="ugc nofollow">http://social.technet.microsoft.com/Forums/en-US/onlineservicesmigrationandcoexistence/thread/c6513ef5-149d-40f4-a0b7-8a7df9ed6205</a><br />
<br />
<a href="http://community.office365.com/en-us/forums/162/p/8664/36120.aspx#36120" rel="ugc nofollow">http://community.office365.com/en-us/forums/162/p/8664/36120.aspx#36120</a><br />
<br />
<a href="http://technet.microsoft.com/en-us/magazine/gg675925.aspx" rel="ugc nofollow">http://technet.microsoft.com/en-us/magazine/gg675925.aspx</a>
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Please refer below link this might be help you out.

http://social.technet.microsoft.com/Forums/en-US/onlineservicesmigrationandcoexistence/thread/c6513ef5-149d-40f4-a0b7-8a7df9ed6205 [http://social.technet.microsoft.com/Forums/en-US/onlineservicesmigrationandcoexistence/thread/c6513ef5-149d-40f4-a0b7-8a7df9ed6205]

http://community.office365.com/en-us/forums/162/p/8664/36120.aspx#36120 [http://community.office365.com/en-us/forums/162/p/8664/36120.aspx#36120]

http://technet.microsoft.com/en-us/magazine/gg675925.aspx [http://technet.microsoft.com/en-us/magazine/gg675925.aspx]

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Hello,<br />
<br />
I have a client that needs to move from exhchange 2003 to office 0ffice 365 hosted email. &nbsp;All they needs in the mailbox and shared calenders through public folders. What will be the easiest way to do this?
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Hello,

I have a client that needs to move from exhchange 2003 to office 0ffice 365 hosted email.  All they needs in the mailbox and shared calenders through public folders. What will be the easiest way to do this?

migrating exchange 2003 to office 365 hosted email (exchange online)

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.