I have been reading a few threads and have been working with Zimbra for over a year now. I am about to implement a Zimbra NE server and they want to keep all mail as possible. Currently there are a few 6-9GB mailboxes in Exchange. Some of those users have a few 2GB PST's that would like to be imported. I plan to use the old mail management of the NE version to offload old mail onto cheap storage. The future looks like they will have 20GB+ mailboxes over the course of a few years.

Has anyone hit a point where the mailbox size has created an issue like it would in Exchange/Outlook? Outlook still seems to craw if the OST/PST is over 2GB even in Exchange/Outlook 2007.

If you have large mailboxes, please post up some examples and if they cause any issues.