Outlook 2016 exhausted shared resources & cant configure nst

Refer to the 2 attachments:
1.got this error of 'outlook exhausted shared resources' when
   I tried opening  archive pst/folders or move files to archive
2. when I exit & restart Outlook, it gave the error 'cant configure
    ... .nst(2)'  

I verified I could copy the nst file & attempted successfully
 "takeown -f the_nst_file"
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Saif ShaikhServer engineer Commented:
If the problem is with archive pst then run scanpst tool on the archive.

It's a free tool from Microsoft.
sunhuxAuthor Commented:
Not a pst issue as the 5 pst files could be read on another laptop:
also not likely all 5 pst are affected at the same time.
sunhuxAuthor Commented:
Rebooting Windows resolved it but would like to know what caused it
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Saif ShaikhServer engineer Commented:
We cannot provide a root cause. If the PST was accessible from another laptop, then check the outlook profile on affected desktop. Try to configure a new outlook or windows profile.
sunhuxAuthor Commented:
Rebooting helps as certain Windows resource must have got exhausted

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Michael B. SmithManaging ConsultantCommented:
This is because Outlook has a limit on the amount of memory it allocates to PSTs. You had too many PSTs open at once. Here is a good resource on this problem: https://answers.microsoft.com/en-us/msoffice/forum/all/outlook-has-exhausted-all-shared-resources-error/4fbd7390-e31e-40bf-97e6-b27f983cbec1
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