CRM integration with a legacy system is not easy, regardless of vendor
By Paul Greenberg, President, The 56 Group
SearchCRM.com
Also, you need to be cognizant of the architectural changes between the version of the accounting system you're using and the current version of the same vendor's CRM system. Perhaps you're still using a client/server based accounting system but their CRM system is Web-services based or based on a service-oriented architecture (SOA). Same vendor, different architecture. That's a giant, "Oops!"
In other words, worry about integration now, but don't worry about whether it's the same vendor's system or not. Get one that easily integrates (although integration is never that easy) with your accounting system – but that meets your business requirements – regardless of vendor.
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