Outlook 2010/2013 OST & PST corrupts very often, especially when using IMAP

We have two computers using Windows 8.1 64-Bit. One has Outlook 2010, the other 2013.  Over the course of almost a year, the there have been at least a dozen corruptions of OST/PST, often non-repairable by ScanPST. The problem occurred occasionally with POP3 accounts configured for PST use, but is happening very frequently on IMAP accounts using OST.
RCC_TechAsked:
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John HurstConnect With a Mentor Business Consultant (Owner)Commented:
Then if PST files are regularly corrupting, people are either being very careless, or shutting down with forced power offs (bad thing).

I have been working with the same base PST file that ultimately came from Outlook 2002 13 years ago. It still works fine.
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John HurstBusiness Consultant (Owner)Commented:
Corruption should not happen with POP3 and no IMAP. Flaky connections may cause PST corruption with IMAP.

Make sure these machines are scanned thoroughly for viruses.

Make sure users are allowing complete downloads of large attachments before closing Outlook and shutting down.
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RCC_TechAuthor Commented:
The problem is happening at 2 different sites with 2 different users.  They are both free of viruses. Attachment sizes are fairly low.
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John HurstBusiness Consultant (Owner)Commented:
The only other thing that can readily corrupt a PST file is keeping it on a network drive or on a different computer.

If not that, then users are being careless.
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alanccwCommented:
How large is your PST files. With PST files larger than 20GB, it is easy to get corrupt. See http://www.datanumen.com/articles/prevent-pst-corruption.htm for more detailed info on how to prevent PST file corruption.
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RCC_TechAuthor Commented:
Both OSTs are under 2GB, created in the newer format so they are not subject to the old 2GB limit
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John HurstBusiness Consultant (Owner)Commented:
Did you check about being on network drives?
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RCC_TechAuthor Commented:
Yes, they are both on local drives
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John HurstBusiness Consultant (Owner)Commented:
Thanks and I was happy to help
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