Using Classic Outlook on Windows for personal email, calendar, and contact management
A 2012 answer seems to help and thanks to:
Roady [MVP]
History
| 11/5/2012 8:01:25 AM | Created | Roady [MVP] |
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Change the window state of your main Outlook window from Maximized to normal. Resize this window to your liking. Now open a new Outlook window and resize this to your liking as well. Close this window and then close the main Outlook window. These sizes should be remembered now.
Robert Sparnaaij [MVP-Outlook]
Above taken from: https://answers.microsoft.com/en-us/msoffice/forum/all/open-in-new-window-doesnt-remember-size/381a1c3f-1b61-45d7-80ff-2969bf69536e