Either of the styles mentioned (-webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px;) will not work in Outlook. Look at @awis's comment where he points you to a way to make rounded edges in Outlook –
\nborder radius not working on iphone
I thought that fiddle example will be enough. Border-radius and border-shadow works well for table, but border-radius don't limit table cells.They require own border-radius matched to table border-radius to limit background fill. You even don't notice that while you don't use cell background. –
I was able to reproduce the issue on the stable and the master channel the border Radius in the below code sample works till a certain height, Increasing the height of the Container seems to be affecting ClipRRect's borderRadius. This seems to be happening when the Container overflows horizontally (horizontal overflow is not shown in a column),

I seem to be having a weird problem when using border-radius and overflow: hidden together, please see the picture for my problem. As you can see in the bottom right the image doesn't expand to the very edge of the div and a little curve is visible, any help will be much appreciated.

border is not a equal control to frame, there is not corner radius. but, IsClippedToBounds="True" is the solution. Not related with the issue, which we must fix but you can use any Shape with the Border, included a RoundRectangle where you can set the radius from any corner.
the issue is with the pseudo-elements. you cant set a border-radius there as f.e. the bottom line has a height of 2px and a width of 100%. you can't set a border-radius here / it is not doing the thing you want. i've seen similar things with an svg, that is animated -> drawing the ring. – xhhvuS.
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    • border radius not working on iphone