How many mails can thunderbird receive?

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http://forums.fedoraforum.org – I think thunderbird doesn't support unlimited mails. It supports upto 1GB i guess. How can i monitor these space? Is there a GUI tool available for thunderbird showing the remaining space or the no of mails that i can receive ? Is it possible to increase the thunderbird mail storage capacity? If not what would be the good solution, if my mail box gets full? A need solution will be good and it will help all users. Thanks in advance.. (HowTos)