Outlook ost can't be opened

ost size near 20GB. repair and delete ost can't fixed the problem.
Is it normal? or outlook connector have problem.
THanks.
john

An ost-file is merely a cache of an online Exchange or Hotmail mailbox. If you delete it, the cache will be rebuild.
The default limit of an ost-file is 20GB in Outlook 2003 and Outlook 2007 and 50GB in Outlook 2010. To increase, see;
http://www.msoutlook.info/question/99
However, depending on your system specifications, performance might degrade. Additionally, you might want to consider cleaning up your mailbox. For an effective and reasonably quick approach see;
http://www.howto-outlook.com/howto/cleanmailbox.htm
Robert Sparnaaij
[MVP-Outlook]
Outlook guides and more: HowTo-Outlook.com
Outlook Quick Tips: MSOutlook.info

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my outlook ost files does not work what i do? How to access my outlook ost file again any please gives any solutions to easily access and convert ost file into outlook?

First of all, I just wonder what is your meaing of "does not work", whether you can still access the data in the OST file, but get some error messages, or you cannot access the data at all? Based on different cases, you should use different solutions and
will save you a lot of time and money.
Without mor specific information, I have to give out general advices here:
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Second, if you can access the Exchange server containing the account data for the OST file, then you can use Export-Mailbox command to export the data into a PST file, similar to convert your OST file into a PST file. Below is the article about doing that:
http://technet.microsoft.com/en-us/library/bb266964.aspx
http://technet.microsoft.com/en-us/library/cc535123.aspx
Third, if you cannot access the OST file via Outlook, neither can you access the Exchange Server, then you can refer to Outlook MVPs' website discussing about this issue:
http://www.slipstick.com/problems/pst-repair/convert-an-exchange-offline-file-ost-to-a-personal-file-pst/
Forth, there are many third-party OST to PST conversion tools you can try, below is a list of them:
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Outlook ost can't be opened

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