Well, at least people are able to use this feature due to the fact that this app is available on multiple platforms starting with Windows Phone, Iphone and Android. You can invite your friends to use this feature provided that they use the Hotmail account which is now the Microsoft account. Room app lets you share notes, calendar, photos and participate in a group chat with people you choose but Microsoft surely recommends that the whole group of yours should be having Windows Phone 8 as it has the best feature list.
I don’t know if this can work on Ipod Touch, IOS tablets, Android tablets and Windows 8 devices but here’s how for Calendar. If you’re using Windows Phone 7, IOS or Windows 8, add your Microsoft account as an email account on your device. Then, the room calendar will shop up alongside your other calendars with the same name as the room. But if you’re using Android, get the Hotmail app from Google Play and sign in to the app with your Microsoft account. Then go to the calendar app to turn on the room calendar. Once again, this feature works best with Windows Phone 8.
For photos and videos, get the SkyDrive app and sign in to it with your Microsoft account. The room photos and videos will show up as the shared folders with the same name as the room. This applies to Windows Phone 7, IOS, Android and Windows 8 users. Lastly for notes, get the OneNote app and do the same thing as you do for SkyDrive app. It also applies to four platforms as already mentioned.
I guess that Windows Phone 8 already has those apps as part of the operating system but it is a shame that you surely have to follow the instructions above if you’re using Windows 8 which sounds kind of bullshit in the first place.