Some Exchange-related articles on this site :

For Exchange 200x :

How To Programmatically Get Exchange Server Names From Active Directory

For Exchange 2010 :

Installing Exchange 2010 on a MacBook with OSX!

For Exchange 2007 :

Speed Up A Slow MS Exchange 2007 DC Reboot
Mailto: hyperlinks and OWA 2007
Removing the Public or Private Radio Button in MS OWA 2007
MS OWA 2007 Logon Time Restriction or Time Limit
MS OWA 2007 Show the BCC Input Field by Default
Listing Your Inbox Contents with EWS FindItem
Searching Another User's Inbox With EWS FindItem And Restriction
Finding A User's OOF Status With EWS GetUserOofSettingsRequest
Passing URL Parameters to the MS OWA 2007 FBA Page
Disable The Out-Of-Office Warning In MS OWA 2007
Display A Welcome Message For New Users In MS OWA 2007
Close The Browser Window Immediately When Logging Off in MS OWA 2007
Block Or Allow Users Depending On Location in MS OWA 2007
Remove The Basic Or 'Light' Option Checkbox In MS OWA 2007
Add Some Guideline Text To The Change Password Page

For Exchange 2003 :

Add Captcha Input To The Outlook Web Access 2003 FBA Login Page
Mailto: hyperlinks and OWA 2003
Close The Browser Window Immediately When Logging Off in MS OWA 2003
How To Fix The Language Of The OWA 2003 FBA Login Page
Logging OWA 2003 access
Persuade the OWA 2003 FBA logon page to remember your usernames

For Exchange 5.5 :

How to modify the logon page for MS OWA 5.5
Logging OWA 5.5 access

Some other stuff that might interest you :

How To Test Your Infra-Red Remote Control With A Digital Camera
How To View The Chronological Edition Of The Film 'Memento' On The Standard DVD

Some external OWA-PDA-related articles :

www.forefrontsecurity.org

Using IAG 2007 To Publish OMA/OWA Based On Device Type In E2007

www.netometer.net
OWA-PDA installation - Exchange 2003
OWA-PDA usage demo - Exchange 2003
OWA-PDA installation - Exchange 2000
OWA-PDA usage demo - Exchange 2000
OWA-PDA installation - Exchange 5.5
OWA-PDA usage demo - Exchange 5.5