I am running office 365, outlook 2013 on exchange. I set up all my details and can send receive emails fine. When I import my old pst to get my old emails from our existing server, the mail box drops from the send receive option and I am no longer able to get emails.

Any troubleshooting I can do on this one, I am out of ideas.

Thanks

Hi,

Please make sure the Exchange account has been set correctly in your Outlook 2013.

To do this, please go to FILE > Account Settings > Account Settings and check if the Exchange account has been set as default there. Also check under the Data Files tab, make sure you are using the correct data file.

We usually use Open Outlook Data File instead of Import pst file to get the old emails. To do this, go to FILE > Open & Export > Open Outlook Data File, and then find the pst file, click OK.

Please try to test with Open Outlook Data File in a new mail profile and check if the issue persists.

In addition, little confused about the mail box drops from the send receive option. If above wouldnt help, please provide more information about this issue, Ill follow up on it.

Thanks,

Steve Fan
TechNet Community Support