Just writing down few key points regarding the Business Rules in CRM 2013.
- Business Rules run on client side so any custom server side code or data import will bypass it.
- Business Rule can be created for a specific form or all the forms of the entity.
- Business Rules execute offline and also for tablet client.
- If else conditions are not supported.
- Rule are created for a single entity.
- No support for or conditions.
- If there is custom JavaScript and two business rules written on same condition, the custom JavaScript will run first, followed by the order in which the business rules have been activated.