I have created a v. simple workflow in SharePoint Designer for my
MOSS2007 site that assigns a task to a user (me in fact). When I run
the workflow I correctly have a task assigned with the following text
in it:

------------------------
To complete this task:
1. Review xyz.
2. Perform the specific activities required for this task.
3. Use the Edit this task button to mark the task as completed. (If
you cannot update this task, you might not have access to it. Click
here to request access.)
------------------------

xyz is a link to a list item and this works as expected. I'm on
Outlook 2007, so I get the "Edit this task..." button in the ribbon,
but when I click it I get the default edit form - i.e. the
http://[server]/[site]/Lists/[list name]/EditForm.aspx - instead of
the automatically created (by SharePoint Designer) workflow form -
i.e. http://[server]/[site]/Workflows/[workflow name]/[step name].aspx

The consequence of this is that I don't get the "Complete Task" option
on the form, and I can't find a way to complete the task to allow the
workflow to proceed.

I'm sure this is something obvious, and apologies in advance if it is,
but your help woul dbe much appreciated!