Share an account among users
Each Gmail account is intended and designed for use by an individual user. If you have multiple users frequently accessing the same account from various locations, you may reach a Gmail threshold and your account will be temporarily locked down.
With the user-managed groups service, you can use groups to create "shared mailboxes" for your users. With a shared mailbox group, users can send and reply to messages using the group's email address rather than their own addresses.
If you're interested in using Google Apps as a CRM solution, please visit the Enterprise Solutions Gallery for a list of Google Enterprise Professional partners and other third parties.