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Can I delete my old Exchange databases after moving Exchange?

I moved Exchange 2003 on 03Server to Exchange 2010 on 08Server.  I went through the various steps and have finally uninstalled Exchange 03 from the old server.  Everything appears to work fine with the exception of some random 0x8004010f errors that appear to have something to do with autodiscover.  There are also a few problems with individual users updating their global address list.  These are annoying, but not stoppers.  The point is, the system is NOT running perfectly yet.

The reason for my post is I would like to use the old Exchange Box (which is now my best server) to upgrade some of my older systems.  To do so, I need to remove the old Exchange Databases:  pub1.edb, pub1.stm, priv1.edb, and priv1.stm.  These are still fairly large files, which makes me wonder if they contain important stuff, being as I thought I moved everything that needed to be moved.  Is there any situation where I will need to access these files to fix something on the new box?  Or can I safely delete them?
2 Solutions
If you have moved all of your users and public databased you can safely delete the files. The best way to test it is to just shut the old server down and look for any issues.
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srsdtechAuthor Commented:
<If you have moved all of your users and public databased you can safely delete the files. The best way to test it is to just shut the old server down and look for any issues.>

I have run the system with the old server shut down for some time, though it is currently on.  Still saw the same minor issues I described, but everything seemed to work okay (OWA, internal/external email.)  I think I have moved everything I need to,  but if there is still something there (and there definitely is, because these files are large) then it would appear I copied rather than moved them.  Is that what actually happens ("they" shouldn't say move when the files haven't really moved...)?

<look for event 8207>
Didn't find it on either box.  I glanced at your links and will digest them further when I have more time.

I am still hesitant to delete.  Let me rephrase my burning question:  If exchange has migrated and the old exchange has been uninstalled from the old server, is there any situation in which it would be helpful to still have the old databases?  My thought is that the exchange connections have been severed with the uninstall so they are now just dead weight, but I don't know if they can still be accessed for some possible need or not.
jfletchsterIT ManagerCommented:
I would copy the old database files to an external device and keep them for the sake of (just in case). But there is no reason to keep them on the old server. they are just as usful on a USB hard disk. the only real reason to keep them is if you ever wanted to mount them using a recovery tool to pull old emails out of them
In answer to your burning question No delete the files
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