Outlook/Office 365 crashing, unable to open files


  1. MSRadell
    Posts : 140
    Microsoft Windows 10x64 Pro build 19044.1949
       New #1

    Outlook/Office 365 crashing, unable to open files


    On a regular basis Outlook 355 crashes giving me the error "The file C:\Users\Msrad\AppData\Local\Microsoft\Outlook\AAAA@Outlook.com.ost cannot be opened" with the AAAA being my actual email address. When this happens the same thing happens for all 5 email addresses I have installed in Outlook. I've done a complete reinstallation etc. and the problem is still there. I'm not having a problem with any other up with programs or any other programs at all for that matter. The machine has a 11th generations i7 processor, 32 GB of RAM, 2 SSD's etc. and I'm running Windows 10x64 Pro build 19044.1949 with all the latest updates on all drivers etc.

    Any idea what's causing these crashes? I can either reboot and it comes back up fine again or I can do a repair through "Settings" to get it operational again.
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  3. Try3
    Posts : 16,966
    Windows 10 Home x64 Version 22H2 Build 19045.4170
       New #2

    It sounds, to me, as though your 'mail profile' might be corrupt. I am not sure though.
    The problem survived reinstallation because the mail profile is a Windows component rather than an Office one.

    I have never had to deal with a corrupted mail profile but I'd use the advice in
    Adding-Recreating a Mail Profile - HowTo-Outlook
    if it happened to me.


    You might also want to search the forum for mail profile or Outlook crash to get further guidance.
    Advanced Search - TenForums
    - There are, for example, some interesting comments in this thread -
    - And it's possible that a corrupted mail profile was responsible for this only-partially-resolved incident -


    Best of luck,
    Denis
    Last edited by Try3; 13 Sep 2022 at 01:15.
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  4. MSRadell
    Posts : 140
    Microsoft Windows 10x64 Pro build 19044.1949
    Thread Starter
       New #3

    I just got done creating a new profile so I'll have to see how it runs before making a final commitment but so far so good!
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  6. Try3
    Posts : 16,966
    Windows 10 Home x64 Version 22H2 Build 19045.4170
       New #4

    I'll keep my fingers crossed as well.

    As soon as you're confident that the problem has been fixed, you can make a new system image.
    my ditty - File backup vs imaging, imaging utilities, backing up drivers [post #3] - TenForums


    Thanks for the rep,
    Denis
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  7. MSRadell
    Posts : 140
    Microsoft Windows 10x64 Pro build 19044.1949
    Thread Starter
       New #5

    Unfortunately that didn't solve the problem. It may be a little better maybe not but it's definitely still here. I've done a complete reinstall, created a new profile and actually even did it in place reinstall of Windows 10 and it still is here, I'm not sure what to try next.

    Any suggestions are appreciated!
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  8. Try3
    Posts : 16,966
    Windows 10 Home x64 Version 22H2 Build 19045.4170
       New #6

    Have you tried to repair the ost file? I am not hopeful since the problem is reported as not being able to open it rather than finding problems within it.
    Repair Outlook Data Files (.pst and .ost) [all versions] - OfficeSupport


    Best of luck,
    Denis
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  9. MSRadell
    Posts : 140
    Microsoft Windows 10x64 Pro build 19044.1949
    Thread Starter
       New #7

    Yes I tried that and I actually blew them all away and let the system generate new ones!
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  10. Callender
    Posts : 6,856
    22H2 64 Bit Pro
       New #8

    Try compacting your data file.

    See:

    Reduce the size of your mailbox and Outlook Data Files (.pst and .ost)

    Also see:
    Investigate possible issues caused by add-ins

    I'm not expert on this but you can try these two suggestions.
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