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All IT vendors can make their product interface with existing systems. This is true.  Problem with interfaces is they are usually expensive.  What is an interface?  It is a connection between two different data systems that lets one system know what language the other system speaks.  The interface can also convert the data language into usable form for a differing system.  Often an existing established company seeks to maintain proprietary rights, and territorial rights.  Therefore they will charge a "right of way" fee to the system that wants to talk to theirs.  These fees usually range from $15,000-$35,000 per interface.  If they don't grant the right-of-way, it may be because they are trying to develop a comparable product.  Often large IT companies "promise" modules to meet the clients requests, but many times the resulting product isn't as user friendly as a niche vendor.
Rule:   Obtain interface fees and permissions before installing a new IT system.  One vendor will never have the best of everything, so it will most likely be necessary to piece together the best systems modules available.