We are using Zimbra as a complete Outlook replacement although we have a very Microsoft-centered userbase. We're trying to break the death grip, but people are definitely against giving up MS...
One of our important users has had his workflow seriously hampered by Zimbra. He spends a large amount of time editing documents and resending them - in Outlook this consisted of double-clicking an attachment open, making changes, saving, and then instantly being able to send it back.
In Zimbra, however, he has to download the attachment (which goes to a temp directory), then save it, then try and find the saved version in temp files (or else explicitly indicate where it should save) and then reattach. Apparently this adds a load of work for him.
Any thoughts on the process?