zoneinfo and zoneinfo-outlook can not be used simultaneously
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Without restarting the JVM generate an iCal first by using the TimeZoneRegistryFactory and then one by using the OutlookTimeZoneRegistryFactory. The second generated iCal does not contain Outlook specific time zones because time zones are cached statically in TimeZoneRegistryImpl in static field DEFAULT_TIMEZONES. So the JVM needs to be restarted to be able to generate iCal files conform to Outlook and afterwards conform to other clients or vice versa.
Ticket moved from /p/ical4j/patches/77/