Another awesome work by the Exchange Team.
The Exchange Server 2010 Deployment Assistant allows an Administrator to create Exchange 2010 on-premises deployment instructions that are customized to their environment. The Assistant asks a small set of questions, and based on a customer’s answers to those questions, it provides a finite set of instructions that are designed to get the customer up and running on Exchange 2010 and well on their way to decommissioning legacy servers. The idea is that, instead of wading through the 2000+ topics in the Exchange 2010 library, a customer can answer a few simple questions, and the Assistant gives them just enough customized content to do the upgrade.
Currently, content is available for customers upgrading from Exchange 2003. Additional upgrade scenarios will be available in the tool in early 2010.
http://technet.microsoft.com/en-us/exdeploy2010/default.aspx#Home

I had a user who said he’s missing his Out of Office assistant option in outlook 2003 tools menu.
He’s able to access his Out of Office assistant option through OWA but not with Outlook 2003, then I found the issue, you can follow the below instruction to get Out of Office assistant option back in outlook 2003.
Open Outlook
1. On the Tools menu, click Options, click Other, click Advanced Options, and click Add In Manager.
2. If Exchange Extensions Commands appears in the list of add-ins, click to select it.
3. If Exchange Extensions Commands is not on the list, click Install. From the list of add-ins that appears, double-click Emsuix.ecf
This should solve the missing Out of Office assistant option issue.