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alexeipalexeip 

salesforce.com data model change process

i have questions regarding the process followed by salesforce.com when changing the data model (i.e. definitions of standard tables: http://www.salesforce.com/us/developer/docs/api/index.htm):
  1. does salesforce.com inform its customers about up-coming changes?
  2. does salesforce.com apply changes to all organizations at the same time? or, is it possible that some organizations will use old data models while other organizations have been migrated to the new one?
  3. does salesforce.com apply changes to all organizations on both the 'real' and sandbox sites at the same time?
  4. does salesforce.com ever delete any of the standard objects or their columns without providing new alternatives?
thanks
SuperfellSuperfell
1. Release Notes that include data model changes are normally published before the release.
2. No, changes are rolled out typically on a per instance basis, e.g. as of today, cs0, na0, na1, and some others have been updated to winter 08 release, but others have not.
3. No. (see 2)
4. Sometimes objects/fields are deprecated and won't appear in new API versions, but will continue to be available in old api version.
alexeipalexeip
regarding #2, when changes are rolled out on a per instance basis, do you update data model of all organizations, belonging to an instance, at once?

thanks.
SuperfellSuperfell
Yes, releases are rolled out to an entire instance in one shot.