![Thunderbird logo](https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/products/2024-02-12-07-36-53-599028_1.png)
How to update Thunderbird 78 to 91.6 without losing all my old email?
My Thunderbird 78.13.0 (64-bit) has asked me to upgrade to 91 for a while. I tried the 91.4 last December, but I lost all my old emails in 7 email accounts in the process. Fortunately I was able to restore my Thunderbird 78 from backup file even though I lost some email that was in the new Thunderbird 91.
Right now due to the strange characters embedded in my email sent from V 78 when other people receive them. It becomes unusable now.
Q1: Do the strange characters appear in the email sent out from Thunderbird 91?
I have @verison.net, @gmail.com, and other business email accounts. I have Windows 10. My Dell has 2 TB SSD C drive for programs and 8 TB D Hard Drive for data. I want to keep all my email in D drive.
I read about the Profile. But I was not successful to upgrade to 91 last December.
Q2: Can you give me Step by step instructions so I won’t make mistakes?
Όλες οι απαντήσεις (1)
Do the strange characters appear in the email sent out from Thunderbird 91?
I'm not going to guess. There are certainly no strange characters in sent messages here. I doubt that this is a problem of a specific version, but more an issue with your profile.
Can you give me Step by step instructions so I won’t make mistakes?
Close Thunderbird and backup the entire Thunderbird profile prior to the upgrade. https://support.mozilla.org/kb/profiles-where-thunderbird-stores-user-data#w_backing-up-a-profile
Then allow the upgrade when prompted.