Sql Server Express db大小限制

After looking at one of our databases I'm finding it confusing if I'm reaching the limit for a sql express db. The database was created with sql server express 2005 but later migrated to express 2008 r2. I understand that as of 2008 databases have 10gb limits but does that mean the database has to be created in 2008 or when I migrated it over it acquired 5gb of extra space.After looking at one of our databases I'm findi