Warwick Rudd ponies up the cash:
With the above limitations, this product can provide all of the functionality for your application to operate as required. Because there is no SQL Agent service in this edition this makes it more difficult for you to implement scheduled database maintenance. We are not going to discuss ways to implement database maintenance on an Express edition of SQL Server in this post.
But at some point in time you may find yourself in the position that you need to perform an upgrade of editions. This may or may not include and upgrade of versions. An upgrade to the version can be achieved and can bring benefits of its own. Normally, I would not be writing about and recommending performing in-place upgrades. However, sometimes due to restrictions of vendor applications it is a requirement to perform an in-place upgrade.
Read on to see what you’d need to do, knowing that Express Edition does not come with a SQL Server Agent and does not perform the appropriate setup for one.