We have an AppExchange application being used by many of our customers.  We are planning to do few enhancements to the applications.  I have couple of questions on how it affects existing application, custom objects and data.

1.  When our customer installs new version of the same application, does it installs as a new application(along with the existing version of it) or it overwrites existing one?

2.  If it creates new one, does it share same business objects used by earlier version of the same application?   Or if it overwrites existing application, does it retain data in all existing custom objects?  How is it going affect custom objects and its data if new custom field is added/modified or removed?

Thanks in advance

-Deepak

We have an AppExchange application being used by many of our customers.  We are planning to do few enhancements to the applications.  I have couple of questions on how it affects existing application, custom objects and data.

1.  When our customer installs new version of the same application, does it installs as a new application(along with the existing version of it) or it overwrites existing one?

2.  If it creates new one, does it share same business objects used by earlier version of the same application?   Or if it overwrites existing application, does it retain data in all existing custom objects?  How is it going affect custom objects and its data if new custom field is added/modified or removed?

Thanks in advance

-Deepak