This blog post is actually being posted on behalf of the very awesome Jay Simcox, who discovered the issue last night. In our morning meeting today, Jay brought this issue up after he wrestled with it last night.
If you're running Exchange 2010 in your environment today you need to be aware of an interesting situation. To get to the crux of the issue we have to toss out to SharePoint 2013. (Huh? Yeah, that's right).
SharePoint 2013 introduces an interesting new service application called the "Work Management Service Application." This service app will aggregate all of the tasks into one central location. The promise is that now you can synchronize tasks between Exchange, Project and SharePoint. Since I'm a productivity nut I find this feature to be very interesting.
The Work Management Service App requires Exchange 2013 for the Exchange piece to work properly. If you want to get this working and you're planning on introducing SharePoint 2013 into your environment, you'll be bringing Exchange 2013 into your enterprise too. Fortunately, Exchange 2013 has shipped as well as the rest of the Office suite. Yay!
Now that we have all of that established… the gotcha.
Exchange 2013 cannot be installed in the same domain/forest as Exchange 2007 or 2010 without some updates. Those updates have not yet been released!
Here's the article that talks about this: http://technet.microsoft.com/en-us/library/aa996719(v=exchg.150).aspx
If you have Exchange 2010 in your environment, you have to wait until Exchange 2010 SP3 ships. According to the Exchange Team Blog, that will be in the first part of calendar year 2013. Incidentally, this SP is also required for Windows Server 2012 compatibility.
For Exchange 2007, it will require SP3 and a future cumulative update. I'm not sure if that CU release date has even been announced yet.
If you have Exchange 2003 or earlier, you're out of luck. You have to implement 2007 or 2010 first.
So the bottom line is - if you already have Exchange 2007 or 2010 in your environment and you want to implement the SharePoint 2013 Work Management Service App as soon as possible… you get to wait a few months.