Palm Treo 755P User Manual page 315

You can change the setting in VersaMail preferences to download fewer than three days'
worth of messages (in which case, more-recent messages are deleted from your Inbox), or
to download all messages regardless of the date (in which case all messages continue to
appear in your Inbox).
I Am Using Microsoft Exchange ActiveSync, But Email Messages, Calendar Events, and Contacts
Information Are Not Downloading to My Device
Check with your system administrator to obtain the name of the mail server that offers you
wireless access to the corporate mail system. If you cannot obtain the name of this server
(some companies do not give it out, because they do not want wireless access to their
servers), server push or wireless synchronization of email messages, Calendar events, and
Contacts information using Microsoft Exchange ActiveSync cannot take place.
Messaging
I Can't Tell If Data Services Are Available
When your phone is on, icons appear in the title bar in the Main view of the Phone
application to indicate whether data services are available and whether a data connection
is active. See "Checking Signal Strength and Phone Status" on page 95 for a description of
the icons that indicate that data services are available.
If your phone is on and you do not see any of the data icons, then data services are not
available in your current location.
I Can't Send or Receive SMS Text Messages
Make sure your phone is turned on (see "Turning Your Device's Phone On and Off" on
page 55).
Contact Sprint to verify that your plan includes SMS messaging services, that these
services have been correctly activated, and that they are available at your location.
Sprint should be able to tell you if messaging services have been experiencing
transmission delays. Delays can also occur between the time that a message is sent and
the time it is received.
Verify with the recipient that the receiving device can handle text messages.
Section 7A: Help 307