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+Compatibility
+=============
+
+This page keeps notes about compatibility between different versions of Soledad
+and between Soledad and other components of the `LEAP Platform
+<https://leap.se/docs/platform>`_.
+
+* Upgrades of Soledad Server < 0.9.0 to >= 0.9.0 need database migration
+ because older code used to use CouchDB's design documents, while newer code
+ got rid of that because it made everything cpu and memory hungry. See `the
+ documentation
+ <http://soledad.readthedocs.io/en/latest/migrations.html#soledad-server-0-8-to-0-9-couch-database-schema-migration-needed>`_
+ for more information.
+
+* Soledad Server >= 0.7.0 is incompatible with client < 0.7.0 because of
+ modifications on encrypted document MAC calculation.
+
+* Soledad Server >= 0.7.0 is incompatible with LEAP Platform < 0.6.1 because
+ that platform version implements ephemeral tokens databases and Soledad
+ Server needs to act accordingly.