ms outlook is not mine software

AudeMorin

But unlucky I have to use it quite often. I'm sitting on Outlook 2010. Just only yesterday, I couldn't simply open my .pst with numerous email messages.

IronFly

https://support.microsoft.com/en-us/help/287070/how-to-manage--pst-files-in-microsoft-outlook

linusdegermark

First one you may check and apply methods below, to read articles and guides, to use manual, and finally only in case nothing of these appears ineffective, then take a look at ost pst