I work in IT, and different definitions of what SaaS means are starting to wreak real havoc on the architecture as a whole.
We are better served just quitting the acronyms and taking the time to talk about a more detailed description of what the service actually adds in terms of value.
Amazon Prime is a subscription for shipping, video streaming, gaming benefits and more. Since software is not the primary goal, but a means of delivery for these other services, I will not consider Amazon Prime SaaS.
I hate the fact that none of the big names support CalDAV natively. DAVx5 is cool and all, but app developers really need to step up their shit and support CalDAV already. Not just Microsoft Exchange and Google Calendar but CalDAV as well. It’s not like they need to rebuild their apps from scratch.
At this point you might just be better served using a web app instead of a native mobile app. Maybe K-9 Mail transformation into Thunderbird Mobile might bring some good news, but I’m not holding high hopes.
Maybe we should, under the EU’s DMA, force anyone that bundles a calendar/note app with their phone OS to support CalDAV as well as any proprietary protocol of their choice.