Text in the mail window scrolling after minimizing it

After minimizing the window and returning back to it, the text scrolls upper a little bit.
Under Windows 7, 64bit, Internet Explorer 9.8112

After minimizing and returning to preview window

Hi Igor,
this is unfortunately a bug caused by the IE core that we cannot change in the current version.
This issue is solved in the upcoming version 7, which uses a solution by Google for the web content and display functions instead.
Sorry for the inconvenience.

Regards,
Olivia