It has a very nice and shiny UI which I really think you should try and some very other very nice new features. However, you should be a bit wary of using it in production environments just yet as there seems to be a bit too many serious bugs as described in this document:
I am working with a customer and we have a specific non-production instance we call "sandbox" which we use to test apps and features outside of the ALM (application lifecycle management) process, so we installed v9 or July Update as it is called and tried it out.
What I found when trying to deploy our unmanaged customization with all the entities which we have changed in the project, was that I got the weirdest error, it complained that it was missing an internal Microsoft Web Resource with the name of:
So, I opened up the customization.xml (yes, all you oldtimers from CRM 3.0 time remember it as the true export file) and searched for the guid and the web resource name in the file. I found that it was actually used on the main form of Compaign Activitiy, and if you look at the read-me document I have linked above, it mentions that the Campaign Activity is one of the entities which does not work. Hence, there is probably some old code in there that Microsoft have decided to remove, and havn't had time to replace.
So, the temporary fix to get our solution to work in Dynamics 365 v9.0 (July Release), go into the customization.xml and then manually remove all <Event> tags which include that webresource, and if the <Events> tag was empty, remove that too. Then put the customization.xml file back into the solution file and reimport it.
The campaign activity still won't work but at least our solution imported. Perhaps there are similar issues with other entities.
I will expect this issue to go away very soon.
And on the issue of if it is ok and supported to manually edit (hack) the customization.xml file I am under the impression that it is as long as it actually import into a system without any forceful shoehorning as it is up to Dyn365 to validate it.
On monday, I will be heading to CRM UG Summit in Nashville which is sure to be a great trip. I am planning to try to make some video there which I will post here and on my Youtube, and don't miss my session on if it is really is a fair fight to compare Online with Onprem? Guess what I will say?
MVP, Founder and Principal Consultant at CRM-konsulterna AB