Originally Posted by BBAdmin
Small Business Edition: full version BES, comes with a 5 user CAL, expandable up to 15 users.
Enterprise Edition: full version BES, comes with a 20 user CAL, expandable to the sky!
If you go for Small Business and need to exceed 15 users you can buy an update key. This willl update your BES CAL's to Enterprise Edition, and will also provide another 5 users in with it.
Unofficially, as of 4.1.2, you could remove the small business edition keys and insert enterprise edition keys directly into the SQL database, and everything will work...again - unofficially
The official stance from RIM is that you need to either purchase the upgrade key, or rebuild your entire server from scratch if you had enterprise CALs, and did not want to purchase an upgrade key.