This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird keeps trying to compact with unrealistic space savings

  • 5 replies
  • 2 have this problem
  • 7 views
  • Last reply by Wayne Mery

more options

I know that I periodically need to compact my Thunderbird and I do that frequently. However, after I finish compacting Thunderbird will ask me again to compact it (maybe a couple of hours or a day later). For example, I receive a message that compacting will save 500 Mb of space, I compact it and a few hours later I receive a message saying that Thunderbird needs compacting and will save around 300 Mb of space. It seems that those "300 Mb" are always there and Thunderbird is unable to compact them. (hope my question was clear!). Thanks, Miguel

I know that I periodically need to compact my Thunderbird and I do that frequently. However, after I finish compacting Thunderbird will ask me again to compact it (maybe a couple of hours or a day later). For example, I receive a message that compacting will save 500 Mb of space, I compact it and a few hours later I receive a message saying that Thunderbird needs compacting and will save around 300 Mb of space. It seems that those "300 Mb" are always there and Thunderbird is unable to compact them. (hope my question was clear!). Thanks, Miguel

Modified by Wayne Mery

All Replies (5)

more options

mmourato, Are you still experiencing this problem?

more options

Yes, unfortunately I am...

more options

Hello there mmourate. We have read your message. We try to help you.

https://support.mozilla.org/en-US/kb/compacting-folders

Thunderbird itself does not perform the compaction of folders itself. See how much space is left while you're doing this. And the times that you’ve already have compact.


Greeting Firefox volunteer.

Modified by user4441246

more options

Hello there mmourato.

Another way to compact folders

For IMAP accounts, Thunderbird can automatically compact the Inbox when you exit: click "Tools —> Account Settings —> [account name] Server Settings", and check "Clean up ('Expunge') Inbox on Exit." If you check "Empty Trash on Exit" it will empty and compact the Trash folder when you exit.

http://kb.mozillazine.org/Compacting_folders

Greetings Firefox Volunteer.

Modified by user4441246

more options

We are currently working on this issue. If you still have problems please post a new support request.