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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. 

Down time is bad.  Dell service can't be beat for those occasional hardware problems.