We have been in the process of migrating our data from an existing ACT database for several months. The migration was imported incorrectly and now we are told nothing can be done to fix it. We call customer service in Texas and the call gets answered by an agent in India. We cannot get any local support and now are six months into the project without 50% of our data.
Please do your homework before migrating an existing database. ZOHO is fine if you are starting with a clean slate.