How can I mount a data file (pst) in new outlook. In the classic version this is doable through the File menu which is not available in new outlook.

To both Rick and Nick above ….

Totally agree. This has f***ed up my life for a month now and I still can’t replicate my server email access settings. But that’s another story.

As to MS's ignorance of this issue, or would it be their dismissive attitude to their customers, I am astounded that the .pst issue should even exist. With all the noise around this issue, and a year of (with respect) MS experts trying to help solve the problem, how is it possible for it not to have reached the C suite?

Are the top brass so insulated from reality that they don’t hear the noise?

Wake up Satya Nadella! People are pissed and our businesses are suffering!!

Totally agree, big issue for me too.

I have archive and backup .pst files. I have no desire to add many very large files to my current new Outlook data file. That's why I have many .pst files.

Without the ability to open and close .pst files I can't move to the new Outlook.

If you open a pst file in the new Outlook, can you then close it? Or save it as a OST file and close it when done?

I have well over ten years of PST files that I access occasionally. I don't think the new Outlook could handle them all at once.

Pure speculation here, but whatever is the most inconvenient way to handle them is what MS will end up doing.