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This is the Thunderbird 2GB inbox splitter project ("tbmailsplit")
This project is hosted by SourceForge.net. The project team describes it as:
Too much mail in your inbox and Thunderbird has stopped working or has gone nuts? split the Inbox file into multiple files. command-line and GUI, GUI is for Windows 2000/vista/7/8. also added is a merge function via a batch file it calls. read the help first. This program solves the problem of having a full inbox (or at least staves it off for a while). the domerge.zip has been made available for those who need only that part. sf.net is buggy in that it won't let me update my screenshots if the same filename is given the next time. sorry folks, I can't seem to get the folks at sf.net to fix that. a version of thunderbird is supposed to be coming or is already here that doesn't have the 2GiB/4GiB inbox problem. however, with the testing I have done, it crashes after 32,000 emails due to lack of 32-bit memory. solution: make tb a 64-bit application. request it of Mozilla by commenting on the mozilla google group
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