Small ISP Bringing email in house

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http://serverfault.com – I work for a small ISP. We currently outsource our customer email management and hosting. Because of customer service issues and management requests, we are looking at ideas of bringing email hosting, and all the troubles that go with it, in house. Currently we provide services for about 50 different domain customers and 30+K email customers for the ISP. Does anyone have any experience in going through this process with some "lessons learned" or "questions you wished you would have asked in the beginning"? Also any recommendations on providers or integrators would be helpful as well, the (HowTos)