I just upgraded all our desktops to MS Office 2007 and I'm having a problem with one of them. I installed MS Office 2007 and put Outlook in cache mode for all the workstations, but one workstation wouldn't allow me to change to cache mode. It gave me an error message saying the mailbox was too big. At that time, the users mailbox was 5.5 GB so I had them archive enough so that the mailbox shows as 1.7 GB on the server. I tried putting Outlook in cache mode after this, but it still says the mailbox is too big. Everything works fine in non-cache mode. Anyone have any ideas on this? I think the mailbox should be small enough at 1.7 GB to allow this now, but it doesn't want to cooperate. Thanks in advance!