Offer Groupware solution to customer
We are searching a good groupware solution which we can offer to our customers. It should contain calendar and addressbook sharing and if possible a mobilphone/pda synchronisation over the air.
I would like, if they can access their existing mail account which they have already with us. We use cpanel.
So far, I found only open-exchange can do this. All the others like Zimbra and Scalix have a own, built in mailserver.
Are there any other solutions then open-exchange, or is open-exchange a good solution?
I hope someone have more information to share.