You can try using the keyboard shortcut Alt+F1 to cycle through on, off, and minimized, but some of the affected users said it didn't work.
I initially thought it might be related to hi-resolution monitors as hi-res seems to cause a number of problems in Outlook, but not only is a small group of users affected, they have a wide assortment of machines.Īt this time the only solution is to turn the pane back on from the View tab, Folder Pane button. We don't have a lot of information on it at the moment but Microsoft is investigating and have a repro. Now back to the problem of the navigation pane disappearing.