troubleshooting Question

Recover from the loss of an Exchange DB.

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Recover from the loss of an Exchange DB.

I have lost an Exchange 2010 Database, without going into it, I have no backup.

The question is how to recover from this situation.
About 20 users.  DB Size approx 200GB
All users of their email in OST files on there PC's.
Exchange is running in a Hyper-V Guest
Have access to the DB Files.

Believe that an underling disk error, on the host, corrupted the DB.
(as a side not - and not that it matters to getting this issue fix, believe the disk was the cause for the backup failures, hence no backup)

Thinking - Create a new DB on a different physical disk.
Move the users to the new DB - is this possible if the original DB cannot be mounted?

So apart from - is this a good way to go - the other questions are;
Do I need to do anything with outlook for the clients to connect to the new DB?
As their mailboxes would be empty in the new DB, will outlook sync the OST file contents back up to exchange?

If the OST wont sync, should I convert them to PST and then manually attach the PST to the Outlook Profile and them move the email into the empty DB.

I appreciate any any scenario I will loose single instance store and therefore the DB will end up larger than the original.

Has anyone used/got thoughts on - using 3rd party exchange DB recovery software?
if it can't recovery everything, then again will the OST sync up the missing emails or are they gone?

Any suggestions help would be appreciate.

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