Exchange 2007 & Outlook 2007 OST Corruptions


Exchange 2007 and Outlook 2007 using cached-mode is one of the most powerful marriages in the business software space. But like most marriages, it can be tough when the partners aren’t working together, or when one of them is having a secret affair with a particular spindle in your RAID set. As the Outlook gains weight and starts cheating with the RAID set more and more, things tend to break. Then you find out. Every time you try to see your kids, the Outlook 2007 tells you that she can’t let you see them because you were a bastard that didn’t take care of her (OST size) or the house (computer) and she will not let you see your kids until you start showing some responsibility, fix the house (defrag) and spend some more time with her (scanpst/scanost).

In all honesty, finding your Outlook OST, corruption the first thing in the morning can be very frustrating. Depending on the size of your OST, you might be waiting for hours for the scan to complete and your mailbox to be restored to its working state.

But what do the users generally get upset the most at? It’s that they feel helpless and can’t figure out how to fix their OST/PST. If it’s a frequently experienced problem, why is it not automatic? Vlad to the rescue.

First, you will now you’re in for a scanost journey when you get the following screen:

Microsoft Office Outlook Offline Folders

Errors have been detected in the file … Quit Outlook and all mail-enabled applications, and then use the Inbox repair tool (Scanost.exe) to diagnose and repair errors in the file. For more information about the Inbox repair tool, see Help.


The complaint is that there is no link to Scanpst.exe. Doing a file search on Vista also turns nothing up. Psst, here is a little secret:

On Vista x64:

C:\Program Files (x86)\Microsoft Office\Office12\SCANpst.exe

On Vista x32:

C:\Program Files\Microsoft Office\Office12\SCANpst.exe

Here is the thing. Before you close out Outlook it will prompt you to locate your set of folders. You can either write down the file location in the error notification above, or you can just go to the next screen “Offline Folder File Settings” and copy the contents of the File section.

On a default Vista system, my OST is:


Obviously replace Vlad with whatever your username is. Now, start Scanpst.exe, select your mailbox and let it work.




This may be a great time to catch up on that Star Wars trilogy you’ve been meaning to watch off Youtube because this process will take forever. Or, if you’re lucky enough to have Exchange 2007 it’s time to fall in love with Outlook Web Access 2007.

9 Responses to Exchange 2007 & Outlook 2007 OST Corruptions

  1. WorkingHard says:


    Since it’s an ost and not a pst, just disable cached mode delete the ost file, enable cached mode. Or are you looking to save bandwith with people over dial up + cached mode with a 2GB mailbox who sync all folders?


  2. Charlie says:

    Yeah, nuke entire PST every time you have an issue and download gigs of email. I think his point was that the interface is not friendly enough to be taken care of by the average worker. I want my Microsoft slapping Vlad back, this is a total pussy copout post.

  3. WorkingHard says:

    @ Charlie:

    with a pst no 😉 … with an ost possible.

    Every time … no I did not say that. But perhaps just in this case that Vlad describes … In a 1200 user exchange environment in 7 sites in 6 cities we see this issue a very rarely and we have the band with to do it. compared to the time the scan takes why not? OWA is also an option as Vlad mentioned. We more often see a auto ost scan when outlook did not close properly but that doesn’t take to long even with large mailboxes.

  4. Can’t say that I’ve ever run ScanOST or ScanPST (did Microsoft combine them for 2007?) against an OST file.

    Since it’s possible that the ScanXXX program won’t fix the corruption, my normal approach is to just rename the old .OST file and let Outlook rebuild it from scratch. I’d rather it take a bit longer and have a 100% certainty of an un-corrupted .OST file when it’s done.

  5. vlad says:

    You know that might work if your servers are local, but if you are remote such as in my case you are not going to redownload 10 GB mailbox, wait for Vista to reindex it all and so on and so forth.

    While I agree that download again is an alternative to what I outlined, for cached mode issues when you are remote its hard to argue. Heck, even using Exchange in RPC-over-HTTP without cached mode from your average hotel or 3G can be painful, image a corrupted mailbox while on the road?



  6. Dan McCoy says:

    10GB mailbox… geesh don’t you ever clean house? Delete those big p$rn files would ya 🙂

    Seriously, how’s about a local pst file to resolve that size issue?

  7. zlatan24 says:

    Where is fine tool-ost to pst software, convert from ost to pst software will convert *.ost to *.pst extension, that can be easily opened by any email client, compatible with Microsoft Outlook, recover your contacts, messages and calendars, is very easy to use even for beginners, we do not care about you computer skills, friendly graphic interface permits to perform all operations in several mouse clicks.

  8. Alex says:

    When i was in similar situation i use next tool-ost to pst convert,as how as i remember software is free,it convert all information from Microsoft Exchange (files with the .ost extension) into files of the Microsoft Outlook mail client (.pst files) – OstToPst procedure,allows you to effectively solve problem ost pst conversion,can use the ost to pst conversion tool to easily move your messages, contacts, notes, meetings, reminders, tasks and all other information,effectively convert all information from the local Microsoft Exchange storage into a Microsoft Outlook file – ost pst conversion (Microsoft Outlook .pst converter),allows you to convert Ost Pst data not only from good, but also from corrupted OST files – .OST file recovery software.

  9. lewis23 says:

    For this concern advise use this tool-ost convertor to pst,also tool is free,it recover data from *.ost format and convert it to files with *.pst extension,restore your personal information, contacts, messages, tasks and calendars may be lost,extract your data from *.ost file, it is stored just to speed up your connection with Microsoft Exchange Server,permit to convert *.ost file to *.pst extension, that can be easily read by any email client, compatible with Microsoft Outlook. Owing to instability of *.ost files, they are often corrupted and may contain viruses, cause email is one of the most popular ways to distribute malware,allows to read even corrupted files and you do not need to put any modifications to recovery process,will never modify source files, so, if you are not satisfied with this program, you can always try to return back to the beginning of process.

Comments are closed.