There are instances when Outlook may close If Outlook closes unexpectedly, such as like during a system update requiring a reboot. Any windows that were open before the program closed are not reopened by default and it can be difficult to resume work from the last session. If you want to restore the open windows from your last session, you will need to run a command prompt.
How to restore windows from your last Outlook session
Open a command prompt or reboot, the windows you had open in your last session may not reopen by default. To restore your previously open windows, open a command prompt window and run the command below (note the space before the between .EXE and /):C
“C:\Program Files
...
\Microsoft Office\root\
...
Office16\OUTLOOK.
...
EXE” /
...
restore
A desktop shortcut can be created to quickly and easily do this anytime it may be needed in the future. To add a shortcut, You can create a desktop shortcut for this command to quickly restore your windows anytime:
Navigate to the OUTLOOK.EXE file.
From Windows (C:), click Program Files (x86).
Click Microsoft Office.
Click Office15.
Locate the OUTLOOK.EXE file.
Right-click OUTLOOK.EXE.
From the drop-down menu, select Create shortcut.
Right-click on the OUTLOOK.EXE shortcut you just created.
Select Properties.
In the Target field, add a space plus /restore to the end of the text. It should look like the following: C:\Program Files (x86)\Microsoft Office\root\Office15\OUTLOOK.EXE /restore
The next time Outlook closes unexpectedly, use this shortcut to restore your last session.