Outlook 2010 Not responding after IMAP folder deletion or copying.

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Outlook version
Outlook 2010 32 bit
Email Account
I am having problems with Outlook freezing after attempts to either delete IMAP folders or copy them to and from the local Outlook account.
Whilst this is bad enough, after closing the program down and restarting it it then won't start and shows an error message saying it can't open the .PST file.
Last time this happened I allowed the program to run on in a "Not Responding" condition and eventually got a message saying the "IMAP server closed the connection".
When this has happened I've tried to repair the .pst file, tried launching Outlook in safe mode (outlook.exe /safe) with no luck.
In the end I've had to restore the whole machine from a disk image which I take every day in order to recover the situation which is really unacceptable.
There are two IMAP accounts configured along with a local Outlook account ( which is where I generally file everything ) plus local Archive folders
It is running on Windows 8.1 with Norton internet security but with the Norton Outlook add in disabled.
The file sizes are - Outlook.pst 330Mb / Archive.pst 28Mb and the two IMAP account .pst files are less than 35Mb each.
Anyone see similar issues ?
Thanks for the reply
Yes, that's correct. I like to file and store my mail locally in "Outlook Data Files" which is backed up daily then I know I am in control and any data loss is down to me.
So, normally I click and drag mail items from my IMAP accounts and file them in these local folders.
If I am travelling and particularly want access to some previously filed items on my mobile I used to use the folder copy command on the local folder and put it into one of my IMAP accounts so that I would have access to it.
Problem is on more than one occasion at this point, it tries to copy the folder and Outlook just hangs and says it's not responding.
On restarting, Outlook is then corrupt - see the original post for the exact details.
I must say I have tried copying folders into another IMAP account recently ( an iCloud account ) and that has worked successfully but it makes me very nervous. I can't risk having to do a whole system restore or even Outlook rebuild every time I want to do this.
Not sure whether this is relevant anyway because I always used to be able to copy folders to my preferred IMAP account as well but stopped when Outlook started hanging.
The .pst file is 228,425kb and a typical mail folder will only have 20 or 30 mails mostly without any attachments.
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