If you have notifications for more than one account, all you have to do is pull down the notification bar on the Droid (it may be the same on the Indredible?) and click on the notification that will say something like '2 new emails in 2 accounts' - or something like that and it will show you a combined Inbox. Not sure if that helps...
On my Moto Droid, with 3 gmail accounts, I only saw ONE notification for all 3 Gmail accounts... i.e. only the latest Gmail account to receive email was in the notification pull down, even if all 3 had received emails.
I haven't setup the incredible with Gmail for mail yet, I'm using Exchange Active Sync for my Gmail accounts instead... So I can't say if the incredible works the same.
Still, if all 3 accounts received email, even clicking on the notification, i have to switch between all 3 inboxes.. to see all the new emails.
I think
buxtor meant. i.e should be a way to NOT have to do that. There should be an option to go to one inbox to see ALL emails and one time, and not have to "switch accounts"
At risk of being called a BB Fan Boy... Handling of multiple email and message accounts is one thing RIM is better at than Android.... On a BB, you can have ALL email and messages (including SMS, MMS, Gtalk, BBM, etc), FB notifications, all show in a single combined inbox, with an "Unread" indicator and counter. You also have the option to have individual/separated inboxes for each account, each with its own Icon and unread indicator. While they are still working on two way Gmail sync of read/unread, RIM has Reply/Reply All/Forward on the menu in each gmail/email inbox, and when reading a message... To me that is an essential feature yet Android doesn't have that on the menu for Gmail accounts, you have to scroll to the bottom of each email conversation if you want to. Yes, Android does have it as soft buttons and on the menu for Exchange active sync accounts (which is why I setup my Gmail accounts this way on my Incredible). These are things that kept me going back to blackberry after getting the Moto Droid, Moto Devour, and is probably going to have me going back even after using the Incredible...
I will have to give K9 a try, and see if it addresses any of my email woes on Android.