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Impact of changing domain on an OST


In about 2 weeks from now, we will be joining about 100 workstations to a new domain.  All these workstations currently use Microsoft Online.

Most of these users also have relatively large mailboxes - about 5GB.

When we join these machine to the new domain, Windows XP/Windows 7 will create a new Windows profile.  Consequently we will need to recreate the Outlook profile.  

Given the amount of data that will need to be synchronized you can imagine this will take days to bring the Outlook data current.

I imagine we are not the first client to deal with this kind of situation.  What options to we have in order to ensure Outlook keeps the same OST file so that it does not need to build a new one and synchronize from scratch?

Thanks in advance.

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1 Solution
MASTechnical Department HeadCommented:
OST file cannot be reused. There is no way you can configure another outlook to use the same OST.
Maybe I'm not clear what you are trying to do here.    Why would you want to salvage the old OST?

If you point a new profile at an exchange server mailbox and tell it to run in cached mode, it will create a new synched OST.  As long as the mailbox still exists it will have everything in it that the old one did.

Are you maybe saying that the old mailbox is going away during the transferr and you want to salvage the information currently in the OST?  

To do that, create a PST before the migration and drag everything from the online box into it.     Then after the migration, mount the PST and drag everything back to the new online mailbox.   I've done that to salvage data off a crashed Exchange box while the drive was sent out for recovery, so I know it works.
On re-reading your question I think I see the issue.   You are assuming a 5 gig mail box has a 5 gig OST file.   Unless you taken steps to change it, it maxes out at 2 gigs.   Look at a few of them and see how big they are.

If you want to spread out the network load, how about installing all of the new clients in non-cached mode then reconfig 10 or 20 a night to cached mode.


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