I have been using Zimbra Open Source for a while in production and it works very good. Now I want to migrate the users from outlook (pop3) to zimbra desktop or zimbra web client and I would like to hear some tips or feedback from you guys... I have a few users with big pst files (30GB) and I'm not sure if there is a limit in the pst size or anything like that. I am going to test the process in a separate server just to check how it works and then I'm going to the production server. So I would appreciate your recommendations or any comment about your experience with this.