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Running Win 8.1; currently have Thunderbird ver 24.6.0; looking to add-on calendar; is it best to upgrade Thunderbird 1st to latest ver & then add calendar?

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Currently running Windows 8.1; currently use Mozilla Thunderbird 24.6.0 for my emails; I would like to add-on a calender; want to know if it is better to look for an older calendar add-on to work with 24.6.0 or if it is better to first upgrade Thunderbird to a more current version and then add-on the most current calendar?

In addition, what is the process to upgrade Mozilla Thunderbird without losing all emails in my Inbox and Saved local folders.

Thanks.

Currently running Windows 8.1; currently use Mozilla Thunderbird 24.6.0 for my emails; I would like to add-on a calender; want to know if it is better to look for an older calendar add-on to work with 24.6.0 or if it is better to first upgrade Thunderbird to a more current version and then add-on the most current calendar? In addition, what is the process to upgrade Mozilla Thunderbird without losing all emails in my Inbox and Saved local folders. Thanks.

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technically there is no process to upgrade. However a backup is never a bad idea. Things can always go pear shaped.

Backup info here https://support.mozilla.org/en-US/kb/profiles-tb#w_backing-up-a-profile

As the add-on site default to the latest version and the calendar is re release with ever Thunderbird version an upgrade is the simple way forward.