Migration Thunderbird de 3.1 à 10.0

[SOGo] Migrationpath 3.x -> 10.x ?

What we have done is:

    * Un-install lightning, connector, integrator
    * remove "calendar-data" folder from user's profile
    * install TB 10 ESR over 3.1 and configure any options (proxy, disable updates, etc)
    * install lightning, connector, and integrator

We do this, so the user gets a fresh copy of the calendar cache, we have noticed that it is smaller than in the 3.1.x versions - it does take some time to initially build the cache but we feel it's better and could present less problems down the road with corrupt cache files...

// Configure Thunderbird update
// https://wiki.mozilla.org/Software_Update
force_bool_pref("app.update.silent", true);
force_bool_pref("app.update.enabled", true);
force_bool_pref("app.update.auto", true);
force_int_pref("app.update.mode", 1);
force_char_pref("app.update.url.override","http://sogo.${domain}/thunderbird/updates.php?version=%VERSION%&target=%BUILD_TARGET%&lang=%LOCALE%");

force_bool_pref("app.update.cert.requireBuiltIn", false);