Command: ModifyPrefs
Namespace: urn:zimbraAccount
Description: Modify Preferences
Notes:
For multi-value prefs, just add the same attribute with 'n' different values:

      <ModifyPrefsRequest>
          <pref name="foo">value1</pref>
          <pref name="foo">value2</pref>
          .
          .
      </ModifyPrefsRequest>
 

You can also add/subtract single values to/from a multi-value pref by prefixing the preference name with a '+' or '-', respectively in the same way you do when using zmprov. For example:

      <ModifyPrefsRequest>
          <pref name="+foo">value1</pref>
          <pref name="-foo">value2</pref>
          .
          .
      </ModifyPrefsRequest>