A good tool for consolidating Windows file servers is the Microsoft File Server Migration Toolkit (FSMT)available from the Microsoft Download Center.
Using the DFS Consolidation Root Wizard, which is included in this toolkit, you can quickly and easily migrate your existing file servers to a single box while maintaining all your old UNC paths so clients won't need to be touched during the migration.
All versions of Windows Server 2008 R2 are x64-based. Migrations between physical operating systems and virtual operating systems are supported.
You might prefer the migration process, rather than an upgrade, even when the hardware is native x64-based.
The Print Management snap-in is not available in Windows Server 2003.
However, some specific network configurations, clients, and hardware may require you to install additional features or enable certain services.