i have not manipulated email activities in CRM using the SDK but assuming
you wanted to set all activities to have a regarding field of comapny a then
yes it should be possible.
here is the email schema - for an update the field you want may not be
here is the update method for email
you need to work out which field stores the regarding then try an update
Microsoft CRM MVP
"Leslie Greenhalgh" < XXXX@XXXXX.COM > wrote in