We are looking at developing a small, simple, Access system for a client using SQL Server Express (2005 or 2008) as database. The only complicating factor is they have two offices and they will need to synchronise some (but not all) data between them.
What are my options with the Express edition for doing this? Is there any advantage to using 2008 over 2005?
Microsoft SQL Server 2008 Express (SQL Server Express) can serve as a Subscriber for all types of replication.
SQL Server Express cannot serve as a Publisher or Distributor.
Ref.
You could look to managing this yourself -- using GUIDs for primary keys, and a last update time stamp, as well as tracking last sync, etc.
If there isn't too much to keep in sync, then it shouldn't be too hard