200 mail limit-prioritizing of inbox iPhone

There is no 200 message limit per mailbox for syncing. That is a Show the most recent messages setting. If there are more than 200 messages in a mailbox and you have Show 200 Recent Messages selected, there is a Load More Messages selection at the bottom of the mailbox below the 200th message, and there is a search feature. If the accounts Inbox mailbox has less than 200 messages, what difference does it make? It does make a difference to those with a limited data plan.
Can you see all however many messages are in the accounts Inbox mailbox at once without having to scroll or do anything with the email client used on your computer for accessing the account or when accessing the account via webmail access using a browser?
How do you prioritize the messages with the email client used on your computer for accessing the account or via webmail access using a browser?
How about making use of additional user created server stored mailboxes to sort received and sent messages by category? All server stored mailboxes will be available automatically when accessing the account with the iPhones Mail app along with all server stored mailboxes kept synchronized with the server.
 MacBook Pro 15" Intel Core 2 Duo/2.53GHz/4GB RAM/500GB HD Mac OS X (10.6.6)  iPod w/Video 30GB,  iPhone 4 32GB