We need to migrate our crm system from sugarCRM CE 6,5,16 build 1 to vtiger 6.5.0 .The idea is to do it as a fixed prise and terms project. You get a sugar dump-file from us and we receive a vtiger dump-file back. Thats what the technic-boys told me to say .
The size of the sugar CRM is not that big: 2750 contacts, 8200 companys, 23900 leads, +customized fields and attached datasets like activitates and notices.
I'am not sure how much effort it takes, but to me it don't looks like a big thing.