I have Thunderbird for my work inbox. Generally it works much better than Outlook Express. However, for the last 2 days, its been saying "Unable to write the email the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox." I have no idea what that means, but Monday I didn't have any issues, this only appeared on Tuesday. I supposedly have lots of disk space, and I can still send out email. Does anyone have any ideas?