HTC Inspire 4G - Manual (Page 100)

100 Email
Checking your Mail inbox
When you open the Mail app, it displays the inbox of one of your email accounts that
you’ve set up on your phone. To switch between email accounts, tap the bar that
shows the current email account, and then tap another account.
Viewing the unified inbox of all your email accounts
You can view email from all your accounts just in one place without having to switch to
different accounts.
Just tap the bar that shows the current email account, and then tap All accounts.
Email messages are color coded so you can easily distinguish which email accounts
they belong to.
Up to 15 email accounts can be shown in the unified inbox.