Thanks for the reply. One company use Entourage the other Mail. All use Mac OS X as their machines. However I will mention this to them.


On 10 Nov 2011, at 08:40, Nelio Vieira wrote:

> Do they use Outlook? 
> We had the same problem, but then discovered that there's a bug in outlook related to a sync file that keeps track of what's read or not.
> See : http://support.appriver.com/KB/a256/outlook-downloads-duplicate-messages.aspx
> 


Regards

Stephen Thirlwell
Black Night Software
LassoSoft Hosting Partner • Certified Lasso Developer
http://www.blacknight.co.uk