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will an old back up of exchange overwrite what is on client pc?

my exchange edb files have disappeared on mdbdata folder. It was about 18gb and then all of sudden it became o bytes. I don't know how could this happened. My question is i have a backup of it which is about 6month old. If I run the recovery from this backup, is the cache files in the client pc will get affected - data loss?
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pcable
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pcable
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CompanionCubeCommented:
Do you have the logs in your backup library available to restore so that you can replay them back in to the db?
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pcableAuthor Commented:
the only backup i have is the on from ntbackup.
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leakim971PluritechnicianCommented:
Hello pcable,

>If I run the recovery from this backup, is the cache files in the client pc will get affected - data loss?
Yes, Outlook will remove the data at the next sync.

Did you try to recover the edb file with a tools like : http://www.restorer2000.com/
You need to preserve any writing operation on the disk where edb file was originaly to prevent replacement of the "deleted" data on the disk.

If possible install the tools (restorer 2000) on another PC and work on an image of the partition

Regards.
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CompanionCubeCommented:
Dial-Tone Restore...
http://www.msexchange.org/tutorials/Exchange-Dial-tone-Restore-Method-Part1.html

About the ost files and profile keys...
The current .ost file remains readable as long as the client opens Microsoft Outlook only in Offline mode. However, users who are working offline are usually not aware that a server reset has taken place until the users try to connect to the server again
http://support.microsoft.com/kb/282496
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CompanionCubeCommented:
By the time that the client receives this error message, it is too late to salvage the old key from the profile. The connection has already replaced the old key with a new key.

You can use one of the following strategies to recover from this situation:
Back up the profile key beforehand.
Recover the key from the original database after you repair or recover the database.
Backing up the profile key
You can back up client profiles by using Microsoft Windows Resource Kit utilities, such as Reg.exe, Regdmp.exe, and Regini.exe (you can configure these utilities to run automatically in a logon script). Regedit.exe is available on every Windows workstation, and you can use Regedit.exe to manually back up profiles.
http://support.microsoft.com/kb/282496
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CompanionCubeCommented:
It'd be best to try to copy mail, objects, etc out of each user's ost to a new pst before they try to go back online with the Exchange server during the mailbox store recovery. Alternativly, you can try to convert the ost to pst no each users' workstation: http://www.osttopst.net/
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Glen KnightCommented:
You can either manually copy the caches contents to a PST file or use something like Kenel to convert them to PST: http://www.kerneldatarecovery.com/buy-ost-email-recovery.html

OST2PST doesn't work for Outlook 2003 and onwards.

Then you can either create a new EDB or use a Recovery Storage Group to mount the old EDB file: http://www.msexchange.org/tutorials/Exchange_Server_2003_Mailbox_Recovery.html

if you still have all the of files in the MDBDATA then you can restore the EDB you have and then replay the logfiles as per:  http://technet.microsoft.com/en-us/library/aa997761(EXCHG.65).aspx
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pcableAuthor Commented:
just found that the priv1.edb disappeared right after the power cut. i check the ups and discovered that battery is dead. now the server in question won't start at all, even replacing it with a new power supply. I guess i have to change my question now. in getting a new machine what is the steps i have to perform to make this new server the exchange server. the dead one is not the pdc, has windows 2003 standard.
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Glen KnightCommented:
You will need to install the server with the same server name and then run the setup.exe /disasterrecovery as per here: http://www.msexchange.org/tutorials/Recovering-Failed-Exchange-2003-Member-Server-Using-Disaster-Recovery-Switch.html
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