Calendar events sent to Outlook client do not work

[Mat Cantin]

Greetings,

I've come across an odd behavior with Kolab calendar ICS event that are 
sent to users using Outlook as their email client: events just show up 
as a downloadable ICS attachment instead of giving them the option to 
Accept/Deny/Maybe like other events. I've confirmed this on Outlook 
2003/2007/2010/2013 and Office 365 webmail. Testing it with Gmail 
accounts worked without issue.

The only thing I can think of is that Outlook doesn't like the ICS 
formating. Is this because Microsoft is again not conforming to 
standards? I hope there's a workaround, a lot of people use Outlook in 
my part of the world.

-- 
Mat