Hi! I'm about to patch a Postfix mail server that I setup following the Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail Ubuntu 8.04 and I noticed there are a lot of packages that need an upgrade. I have a question about the behavior of apt-get upgrade. Will any of the installed packages be affected before the reboot? I was thinking I that maybe there could be complications upgrading while a lot of people are accessing their mail etc. Is it safe to just run the upgrade or should I download the packages first and bring down the network connection before I run the upgrade? thanks in advance!