How do I fix Outlook only showing the first line of every message?

I'm experiencing a strange problem with Outlook 2019. When viewing a message it only shows the first line. On an HTML message, it stops at the first close paragraph tag. On a plaintext message, it stops at the first newline character. This is true if viewing a message in the reading pane as well as if double-clicking the message to open in its own window.

I have the preview pane set to show 3 lines and it does show more of the message so it seems like Outlook can see more of the message than it's rendering in the reading pane. If I use View Source, the underlying data seems fine and the whole message is there.

I've tried the following:

• Deleting and re-creating the user's mail profile
• Uninstalling & re-installing Office
• Creating a new Windows account & connecting Outlook to a different Exchange account than the one that originally exhibited the problem
• Checked for Windows updates
• Checked for Office updates

Any ideas what might be causing this? I feel like I've tried everything obvious & I'm striking out on Google.

Solution 1:

I was able to find a solution to this problem:

1. Open an elevated command prompt (Administrator)

2. Navigate to C:\Program Files\Common Files\microsoft shared\ClickToRun

3. Run the following command:

   officec2rclient.exe /update user updatetoversion=16.0.13901.20462
   

The process takes about 10 minutes but then fixes the problem.