I am about to lose access to my work gmail account (new job). I used Google Takeout to download all my emails in .mbox format. I then used Mozilla Thunderbird (with the ImportExportTools NG add-on) to access the emails. They are currently available in a folder called WorkEmailBackup within my local folders section on Thunderbird. I would like to add these emails to my pre-existing personal hotmail account. I have set this account up on Thunderbird. However, when I drag the WorkEmailBackup folder into my hotmail inbox (in Thunderbird), not all the emails are copied over. Thunderbird says there are 7730 emails in the WorkEmailBackup folder, but only 2212 will copy into my hotmail account. I have tried several times, but the transfer always stops at 2212 emails, and I can see that emails are missing. I have also tried highlighting the emails individually (rather than copying the whole folder), but have had the same problem. Please help :(