Hi,
I believe recently there was an update in new Outlook and now when I select an email, in the right hand panel I have the options to Reply, Reply all and Forward, but they are grayed out.

This is maddening - I have to open each email and then the options are available.
To make matters even more inconsistent, when I open in a new window, sometimes the options become available again in the original client window and sometimes not.
The only thing that I can imagine is causing this is that we are using SMIME and all the emails that behave like this are from colleagues that have SMIME signatures. I know that this feature is "new" to the new client (although existed for many many years in the old client, but why is the simplest feature of replying to an email broken because of SMIME as well...
If anyone has a solution or a workaround for this, I'm all years.
Lazar