Coordinate your repositories
Using a LDAP server is useful to coordinate your contact lists. You can export your ERP5 contact list and information to every LDAP compatible device you own, like a phone or a printer.
Organize your contacts
You will be able to centralize your contact list in ERP5, which means for each person only one name, one email address, one phone number, etc. Once you are confident in the accuracy of the data stored in ERP5 Express, you won't have to check other repositories. Your contact list will be more professional and you will spare time and energy.