can 2 platform servers of different versions (8 and 9)  run in the same environment

can 2 platform servers of different versions (8 and 9)  run in the same environment

  
can 2 platform servers of different versions (8 and 9)  run in the same environment na don the same front end servers
With the Outsystems Platform you can have serveral Environements running with different versions of the platform, although you cannot share the code between those Environments. However, you cannot have multiple front-ends with different versions.

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Best,
José Caldeira
Yes Thanks :)
The addresses ServiceCenter/LifeTime/Users/... are all unique so they can only point to one set of data.
Because different versions wouldn't run on the same data (components, datatypes, everything changes) that isn't possible.
Consider it as an incentive to upgrade and keep your datacenter updated ;)