Conversations is a relatively nice simple app for just one platform. Imagine you convince your company to use XMPP. What would iPhone users use? That's why i'm talking about this:
> a product, which can be easily deployed and will work consistently on every platform.
Hehe, you are correct. I wondered if you would come back to that point when I posted the Quicksy link ;-)
Actually, I don't know why the ChatSecure guys don't get their software to work reliably. It got a lot better over the past two years, but sometimes I still wonder why a ChatSecure user doesn't read my message. In addition, it is not as easy to use as Quicksy/Whatsapp.
One of my friends uses Monal, but in essence, it is the same story as ChatSecure: It kinda works most of the time and got better over the past two years, but I am still not confident it works reliably.
So for iOS, I have no solution and neither do I know of any _high quality_ XMPP client that supports video calls. But in fact, those issues don't stop me from using it :-)
> a product, which can be easily deployed and will work consistently on every platform.