Microsoft small business knowledge base

Article ID: 309501 - Last Review: February 28, 2014 - Revision: 5.1

This article was previously published under Q309501
This article has been archived. It is offered "as is" and will no longer be updated.


After you synchronize Microsoft Works Calendar with a Pocket PC device, and then try to quit Works Calendar, the program may stop responding (hang), or you may receive the following error message:
wkscal.exe Application Error
The instruction at "0x77f5218e" referenced memory at "0x071877228". The memory could not be "written".

Click on OK to terminate the program.


This behavior can occur if both of the following conditions are true:
  • You remove the Pocket PC device from the cradle before you quit Works Calendar.
  • You are using ActiveSync version 3.1.


To resolve this issue, update ActiveSync to version 3.5 or later. To download this update, visit the following Microsoft Web site: (

  • Microsoft Works Suite 2005
  • Microsoft Works Suite 2004
  • Microsoft Works Suite 2003
  • Microsoft Works Suite 2002, when used with:
    • the operating system: Microsoft Windows XP
  • Microsoft Works 7.0
  • Microsoft Works Suite 2006
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