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Even though the system requirements still say IE 8 is support, just not fully supported, it seems it is pretty much unusable in the latest SmarterMail v13.1, I am not sure if the prior SmarterMail v13.0 releases had this working. But you cannot delete any emails, you can check them but cannot do anything at the delete bar at top, it will not let you even right click on the emails too.
If I get a chance I will test prior version to see if this is broken only in latest release.
I understand Win XP & IE 8 are all discontinued, but not everyone is off those, and also the system requirements are not updated saying it will no longer work.