The
Mail app in Windows Phone 7 comes with powerful tools that make it
easier to find and filter mail. For example, you can hide messages that
aren’t important or that you’ve already read. The Search button on your
phone, meanwhile, can pinpoint specific e-mails—handy when your inbox is
brimming over.
1. Sort Your Messages
On the Start screen, tap an e-mail account.

Flick left or right, or tap a heading such as All, Unread, Flagged, or Urgent to show only those messages.

2. Search for a Message
In Mail, press the Search button on your phone.
Tap the search box, and then type the words you want to find.

Tip:
Windows Phone searches the From
and Subject fields, as well as the first 256 characters of the message
body. As of this writing, Windows Phone is not capable of searching the
entire body of a message.