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Mozilla won't load new e-mails and takes forever to open any.

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I decided to switch my e-mail to Thunderbird instead of web client, however, since my web client has 5,000 e-mails in it's inbox from years of use... Thunderbird seems to not be able to handle it.

Whenever I start Thunderbird it doesn't download the new e-mails, nor will it open any e-mails for a long period of time. It's constantly loading something or saying "Downloading header 1 of 5,000"

Just curious if there's a fix, if not I'll just stick with the web-client.

I decided to switch my e-mail to Thunderbird instead of web client, however, since my web client has 5,000 e-mails in it's inbox from years of use... Thunderbird seems to not be able to handle it. Whenever I start Thunderbird it doesn't download the new e-mails, nor will it open any e-mails for a long period of time. It's constantly loading something or saying "Downloading header 1 of 5,000" Just curious if there's a fix, if not I'll just stick with the web-client.

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Pop or IMap mail account? Is it gmail?

Do you use an anti-virus program ? If yes, what do you use?

Do you scan incoming mail ?

Do you have emails in other folders or just the Inbox?

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IMap Hotmail account

Yes Microsoft Security Essentials

Far as I know I don't scan in-coming mail.

Inbox, spam and trash.

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Same thing is happening with me on Yahoo emails. Please anyone with a proper solution??

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Accumulating a large number of messages in Inbox isn't best practice. Keep you Inbox as clean as possible. See http://kb.mozillazine.org/Keep_it_working_-_Thunderbird

The following is to determine whether your anti-virus software interferes with Thunderbird. Try to start *Windows* in safe mode with networking enabled.

- Win8 http://windows.microsoft.com/en-US/windows-8/windows-startup-settings-including-safe-mode

- Win7 http://windows.microsoft.com/en-US/windows7/Start-your-computer-in-safe-mode

- XP http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/boot_failsafe.mspx

Still in Windows safe mode, start Thunderbird in safe mode.

- https://support.mozilla.org/en-US/kb/safe-mode

Does the problem go away?