I've been struggling with the very poorly developed Windows 8 Kobo app for the last year. I finally got it working on a Microsoft Surface RT tablet. I upgraded to a Surface Pro 2 and went to download the app from the Windows Store - and couldn't find it! I went back to my RT - still there, still working, but it's nowhere in sight on my Pro 2 tablet!
I contacted tech support and they informed me that it's been removed from the Store - and there is no estimated timeframe to have it added back in.
All I can say is...wow...this company continues to shoot itself in the foot every chance they get! I had originally supported Kobo because it was a Canadian company - but it isn't anymore. I no longer see any reason not to switch to Kindle for my e-books in the future...and I'll be sure to quite buying Kobo e-book readers too, I guess.
The company is just too unreliable to invest anything more...if they can't even keep the mainstream Windows app working, I have zero faith in their future...!
