Why is microsoft office email opening up as a tiny little box, what happened to the full screen??

Hi!

The window is being restored at a very small size. Even if you maximize it afterward, Windows might not save that change. Try the following:

When this small window appears, instead of maximizing it, try resizing it by its corners. Move your mouse cursor over one of the corners of the window until a diagonal line with two arrows appears, as shown in the image below. Then, click and drag the mouse pointer (up or down) to increase the window's size.

If that doesn't work, I will need more information to assist you further. The issue could stem from the Outlook app itself, screen resolution settings, or Windows... Please answer the questions below so I can gather more details:

1. Are you using "Outlook Classic" or the "New Outlook"? You can identify it by the icon, as shown in the image below:

2. Did the problem start after installing a new monitor, or perhaps a secondary monitor?
3. Does the issue persist if you move Outlook to a different monitor than the one it usually opens on? Try closing Outlook, reopening it, and moving it to the other monitor—does the problem still occur? This test is important to determine if it is a resolution-related issue.
4. It would also be helpful to know which solutions you have already tried, so we can avoid repeating steps.

none of the above suggestions work