Hi, Checked on Google and OTRS mailing list archives for an answer to this question but can't find one. This may have something to do with development. I'm currently on the process of migrating to OTRS for a specific platform and in this way I was asked to restore back on OTRS all of our old Double Choco Latte tickets data so we wil have all historical tickets accessible through OTRS. For the moment, I run into creating data in OTRS by sending custom mails containing old data and so let it create all necessaries entries by itself, so I'm using a lot all of these useful X-OTRS-* Headers BUT I wonder : - is there any "hidden"/undocumented headers like X-OTRS-TicketID or X-OTRS-EmailDate ? It would help a lot because we need to keep Ticket Numbers the same between old and new ticketing system and for dates it would be better if we can keep original creation/modification/resolution dates from original emails. - does anyone see a better way to integrate back all of these datas into OTRS ? Thanks by advance for your answers. Best regards, Laurent