Purely looking at the EMS Email Continuity service side of the software it could work. I very much doubt we publsih any formal documents that say it does.
The only recorded issue appears to be related to the number of BCC recipients messageone adds to the item, which causes us to process the P1 part of the message slowly, this is resolved in EV8 as the algorithm for processing the P1 is more efficient.
From what I can see of the EMS 'how it works' 99% of the time you are using Exchange normally anyway and EMS is purely copying your exchange data to an offline storage hosted by Dell. So 99% of the time the environment will be as normal. So there should be no issue.
The question is how EMS will copy the shortcuts from exchange and will it change them in some way. So when you have an outage is your entire exchange environment replicated with intact shortcuts which allow users to retrieve their items. As I said, these solutions have been seen to work but that is not testimony to it working in your environment.
Also Dell paint a picture of this solution being effective in an huge catastrophe, on their website they have a picture of a large weather system taking out operations. If that is the case you also need to have some kind of backup system for your EV environment, which will include SQL, AD and storage. If you have these on a similar DR scenario, not sure why exchange just can't be on the same DR scenario avoiding the need for EMS.
I think the only answer would be to run it in a test environment for you specific criteria.
