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I would set aside probably a couple of days to a week, this is because I move mailboxes overnight.<br />
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You also need to allow time to backup data from the 2003 server and restore it to 2008 which if you don't want down time will also need to be done overnight.<br />
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Public folder replication.<br />
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Once you move the mailboxes you want to make sure that both exchange servers are up and running together for a couple of days so that all clients update themselves for the new exchange server 
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I would set aside probably a couple of days to a week, this is because I move mailboxes overnight.

You also need to allow time to backup data from the 2003 server and restore it to 2008 which if you don't want down time will also need to be done overnight.

Public folder replication.

Once you move the mailboxes you want to make sure that both exchange servers are up and running together for a couple of days so that all clients update themselves for the new exchange server

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Thanks. I was looking to do this over a weekend as I can take the server off-line Saturday. &nbsp;Other than mailbox and data moves, does a full day seem reasonable, or do you think I will need to go in on a Sunday too?<br />
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Thanks!<br />

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Thanks. I was looking to do this over a weekend as I can take the server off-line Saturday.  Other than mailbox and data moves, does a full day seem reasonable, or do you think I will need to go in on a Sunday too?

Thanks!


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How much time should I expect to spend migrating a SBS 2003 server running Exchange/AD/DNS to SBS 2008 on my first time with SBS? Not expecting exact time here, just a range like 2-4, 4-8 hours. Not sure how much time to allow in my plans. <br />
The 2003 server has a dozen users with 20-GB of mail. Nothing outrageous. Both servers have a Xenon CPU, GB Ethernet, RAID 5 and are decently fast.<br />
<br />
Thanks!
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How much time should I expect to spend migrating a SBS 2003 server running Exchange/AD/DNS to SBS 2008 on my first time with SBS? Not expecting exact time here, just a range like 2-4, 4-8 hours. Not sure how much time to allow in my plans. 
The 2003 server has a dozen users with 20-GB of mail. Nothing outrageous. Both servers have a Xenon CPU, GB Ethernet, RAID 5 and are decently fast.

Thanks!

How long to migrate SBS 2003 to 2008?

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).