Can I migrate Small Business Server 2003 Exchange mailboxes to Microsoft BPOS?

In the MS white paper on migration to bpos or the bpos forums, or the technet site do I find any mention of SBS 2003. I do not assume that just because Exchange 2003 can make the migration that the SBS version can. Can anyone speak to this that has 1st hand knowledge?

Background Info: Our server is beyond it's life but still hanging on. (Dell PowerEdge 600SC) Yes, there is a plan to replace it late this year. In the meantime.... In an effort to relieve the pressure on the server I want to migrate our users to an online email solution. I am looking at Google Apps and BPOS. The BPOS  solution would be the least painful for the end user post-migration since they are already using OWA and is the option of choice due to the fear of loss of productivity learning to use  Google Apps. We are a small firm of 15 with limited resources that works in a highly mobile environment. Going to an online solution for email is part of the master plan. I am open to your expert advice and or recommendations.
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There is no direct migration from SBS 2003 to any hosted exchange solution. You can however migrate your existing exchange server mailboxes to exchange online following this document:
I'm not sure what else you would want to migrate from sbs 2003? could you please clarify these comments:
>>I do not assume that just because Exchange 2003 can make the migration that the SBS version can.
Hope this is helpful and if you need further clarification on any of the steps above or I have misunderstood something please don't hesitate to elaborate.  

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