I have update to Windows 10 and have been using the mail client for a week or so with no problems other than it did not show email attachments on "some" of my emails but did on others.
After the Windows update completed over night 8-7-2015 my mail client is now unresponsive. It will open but that is all. It will not react to any clicks to any of the controls within the mail client.
I have rebooted the machine but there is still no change, it will open and I can close it but all the controls within the program do not respond.
I am glad to see I am not the only one! I change the background picture and am wondering if that is related. I am using outlook now which is better anyway but requires setup. I am not sure what to do without going back to a restore point since you cannot seem to closest the program even in a restart. It is simply unresponsive inside the program and very odd. If a fix is found that would be nice!