I'm getting an error with the following line of code:
DCount("Letter Status","Letter Status","[Letter Status] = 'Received letter'")
The error I'm getting in Access 2007 says
Missing Operator but I don't see how or where.
(Letter status is the name of the field and the table (it's a working design, sorry)
You are missing some square brackets:
DCount("[Letter Status]","[Letter Status]","[Letter Status] = 'Received letter'")
It is best to name fields and tables without using spaces.