HTC Detail User Manual page 131

Inbox filter tabs
Received
Displays email messages as individual items.
Conversations
Displays messages as conversations, grouped according to the subject
line. Tap a subject in the list to show the email conversation.
Group
Displays all email messages from a contact group. To choose which
contact group to display, press MENU, tap View, and then select a
group. For more information about contact groups, see "Contact
groups" in the People chapter.
Unread
Displays unread messages.
Marked (Exchange ActiveSync only)
Displays all flagged messages.
Meeting invitations (Exchange ActiveSync only)
Displays meeting invitations which you have not yet accepted or
declined.
Attachments
Displays all messages that have attachments.
Email 11