1. Stephensonel's Avatar
    I have upgraded iOS on my iPhone6. But after upgrading i cannot open one very important .OST extension file which was emailed to me a month ago.
    Getting the message: Unknown error
    Can anyone explain whats happening and provide a solution? I really need to open this file!
    12-05-2017 11:50 AM
  2. Tartarus's Avatar
    Did you try opening that email on an other device? It via the web interface of the email client?
    12-05-2017 11:55 AM

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