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Essential Contax Professional
Increase your productivity with the ultimate contact manager for the Pocket PC


Essential Contax Professional will enhance your on the job productivity by making your contact information lookups and edits faster and  more effective.

Download Demo
Essential Contax PRO (for Windows Mobile 5 and Pocket PC 2003/2002/2000 devices only)

Please enter your email address to start the download process

Email Address:

Email used for support purposes only

Device brand/model:

Demo Notice:
The fully functional demo version of Essential Contax PRO is limited to loading up to 20 contacts and does not incorporate the advanced features of the program (such as Expert Sort and Group Email capabilities).

See the Version History


Installation Instructions

These instructions apply both to the Demo and the Full version of Essential Contax PRO.

  1. After purchasing the program, you will be prompted to download the installation package (.zip file). Save file onto your PC's Desktop. Double click on the file and un-zip it into a folder on your PC.
  2. Un-install the demo version (if it is installed) by opening the program and tapping on Program>Exit. Then go to Start>Settings>Remove Programs to remove it from the device.

  3. Soft-reset your Pocket PC

  4. Connect your Pocket PC to your PC (or cradle) and establish an Activesync connection

  5. Double click on the .exe setup file to start the installation process. Follow the installation wizard that installs the application onto your device. Install the program in the default location (main memory).

  6. Now you can run Essential Contax PRO from the START>Programs menu on the Pocket PC

Please save the installation files in case you need to re-install the software in the future.


Frequently Asked Questions

Question Is Essential Contax Professional compatible with my device?
Answer Essential Contax Pro is compatible with Pocket PC 2000/2002, Pocket PC 2003/SE and Windows Mobile 5 devices with rectangular and square screens.
Question I am getting a "Failed to load resource DLL MSDAERxx.DLL" message during installation.

Before installing, switch your Regional Setting to English (United States) in Start>Settings>Regional and then install the program. After the installation is complete, switch the regional setting back to what it was and you will be able to use the program.

Question What are the feature differences between Essential Contax and Essential Contax Professional?
Answer Click Here
Question How does Essential Contax Professional integrate with Microsoft Outlook?
Answer Click Here
Question Upgrading your Pocket PC 2002 with the latest Microsoft End User Update (EUU)?
Answer Click Here

When I attempt to execute the program I receive the following error message:


"No Application associated with 'contaxpro'. Run the application first, then open this file from within the application".

Answer This is a simple case of broken associations and a bug in the Pocket PC operating system. When an application that uses Embeded Visual Basic components is uninstalled , the un-install routine of the Pocket PC will remove the .vb extension association.

To correct this, the .vb association needs to be re-created on the Pocket PC.

You need to associate the .vb extension with “pvbload.exe” on the Pocket PC. The easiest way to do this is to use the “myExtensions” program for the Pocket PC.

To download myExtensions, go to:

Install myExtensions on your Pocket PC, run it and then:

  1. You will see a list of extensions on the left of myExtensions. Scroll down until you see .vb
  2. Double tap on .vb to Edit the extension
  3. In the Command field, type without quotes “\windows\pvbload.exe”
  4. In the Icon field, type without quotes “pvbhost2.dll,-2”
  5. In the Description field, type without quotes “VBCE 2.0 Project File”
  6. Tap the green OK button
  7. Soft-reset the Pocket PC

That’s it!

Other Questions?

Contact us and we will be glad to help!


More Information





  Frequently Asked Questions


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