Outlook Cache mode

today it seems that 45 outlook clients all had their ost file coruppted. create a new profile fixes the problem but what would cause this for all of them.

Hi,
There are many reasons that will make your
Exchange offline folder (.ost) file corrupted or damaged. In general, there are two categories: hardware reasons and software reasons.
Hardware Reasons:
Whenever your hardware fails in storing or transferring the data of your Exchange OST files, the OST files will likely get corrupted. There
are mainly three types:
    1. Data Storage Device Failure.
For example, if your hard disk has some bad sectors and your Exchange OST file is stored on these sectors. Then maybe you can only read part of the OST file. Or the data you read are incorrect and full of errors.
2. Networking Connection Failure . When you synchronize the OST file with the server through a
network connection, if the network interface cards, cables, routers, hubs and any other devices constituting the network connection have problems, then the synchronization process will be aborted and the OST file is likely to get corrupted.
   3.
Power Failure. If a power failure happens when you are accessing or synchronizing the OST files, that
may leave your OST files damaged.
There are many techniques to prevent or minimize the OST file corruption due to hardware problems, for example, UPS can minimize the power failure problems, redundant network can reduce the
network problems, and using reliable hardware devices can also reduce the chances of data corruption.
Software Reasons:
Also many Exchange OST file corruptions occur due to software related issues.
1.
Incorrect File System Recovery. You may find it is unbelievable that a file system recovery
may cause OST file corruptions. But in fact, sometimes when your file system is broken, and you try to hire a data recovery tool or expert to recover the OST files on it, the files recovered may still be corrupt, because: 
Due to the file system disaster, some parts of the original OST file are lost permanently, or overwritten by garbage data, which makes the final salvaged OST file incomplete or contain incorrect
data.
The recovery tool or expert doesn't have enough expertise that it/he may collect some garbage data and save them as a file with .OST extension. As these so-called .OST files don't contain any
valid data of the Exchange offline folder files, they are totally useless.
The recovery tool or expert has collected the correct data blocks for the OST file, but has not combined them in a correct order, which also makes the final salvaged OST file unusable.
Therefore, when a file system disaster occurs, you should find a good data recovery tool/expert to recover your OST files. A bad tool/expert will make the situation worse instead of better.
2. Virus or Other Malicious Software. Many viruses will infect and damage the Exchange OST files or make them
inaccessible. It is highly recommended to install quality anti-virus software for your Outlook and Exchange email system.
3.
Terminate Outlook Abnormally.
4.  Deficiencies in Outlook programs.
 Hope it helps.
Thanks 
Sophia Xu
TechNet Community Support

Similar Messages

  • Outlook cached mode, shared calendars, permissions and sync errors

    We have the following environment -
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    Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you. Thank you! Off2work

  • Outlook 2010 stops receving new emails when in cached mode

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    Hi Smitty,
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  • Outlook 2013 set cached mode "Mail to keep offline" to All for existing Outlook profiles via GPO or registry changes

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  • Can't turn on cached mode in Outlook 2013!

    Seriously banging my head against the wall right now!
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    Hi,
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    It's recommended to download and install
    Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
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  • Disable Cached mode through MSP (2010)

    Mojn!
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    Yep Cached mode is a selectable option.
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  • Outlook 2007 cached mode not working for old exchange 2003 users

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    Cheers,
    Tony Chen
    Forum Support
    Come back and mark the replies as answers if they help and unmark them if they provide no help.
    If you have any feedback on our support, please contact
    [email protected]

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