There are many significant business advantages to adopting a web based contact management system or customer relationship management system such as...

Centralize Data
Keep all the contacts of any category plus all the files, notes, and schedules for each contact and for each person within your company in one simple place.

Cross Reference
If your company is using a product like Outlook then your company is missing out on its biggest opportunities.  For example, Johns Outlook doesn't automatically reference with Janes' to make deals happen - but the web CRM system does.  Whether your staff have discussions at the water cooler or not, they are each notified whenever a marriage could occur.

Data Mining
Track your closing ratio's, sales cycle durations, leads generation, and more.  In fact generate reports based on any number of criteria.

Information Ownership
Employees may move on but their contact lists stay put with a web CRM system.  Keep information where it belongs by turning personnel owned information into company owned information.

Reduce Costs
Instead of purchasing multiple copies of desktop CRM software - one for each employee workstation, a web based CRM system can serve thousands of users from a central server anywhere, anytime.