Posted this a couple of years ago, wanting to see if something has improved. I use Google Calendar under Thunderbird / Lightning and need to set reminders at 3,4,5 and 6 months prior to the calendar entry. A Google search does not turn up any hanks or add-ons to extend the four month maximum. So I would welcome anything that will, or recommendation for a totally different calendar solution. The solution has to be workable for Windows / Android / iOS systems. I do not use Outlook for anything.