We have Outlook add-in that uses VSTO and custom task panes using:
Globals.ThisAddIn.CustomTaskPanes.Add
Latest Outlook updates seem to break custom task panes UI with top position:
First this issue was reported by one of our clients which used "Try it now" feature of Outlook to see new features. But now it bug slipped to the final release. We have made a workaround to just add margin for our control and spaces in task pane title, but maybe there is a better way? Pane still look out of place in the new Outlook UI (no rounded corners and so on). Maybe there is a better way to fix this or some info when this issue will be resolved?
Outlook version is: Microsoft Outlook for Microsoft 365 MSO (Version 2207 Build 16.0.15427.20182) 64-bit