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Mifos 1.0 (~April 2005 - Oct/Nov 2006)
Mifos 1.0 took approx 16 months of development - see mifos 1.0 release mail
James Dailey blogged about the gensis of mifos giving some background information in what happened during development of mifos 1.0.
Mifos 1.1.x (Nov 2006 - July 2008, last 1.1.x release was October 2008)
See release notes for Mifos 1.1.x
Mifos 1.1.5 (July 2008 - October 2008)
Mifos 1.2 (October 2008 - Nov 2008)
See release notes for Mifos 1.2.x
Mifos 1.2.1 (Nov 2008 - Dec 2008)
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Mifos 1.3 (Feb 2009 - July 2009)
See release notes for Mifos 1.3.x
Mifos 1.3.1 (July 2009 - Sep 2009)
Mifos 1.4 (Sep 2009 - Dec 2009)
See release notes for Mifos 1.4.x
Mifos 1.4.1 (Dec 2009 - Jan 2010)
Mifos 1.4.2 (Jan 2010 - Jan 2010)
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Mifos 1.5 (Mar 2010 - Apr 2010)
See release notes for Mifos 1.5.x
Mifos 1.5.0.1 (Apr 2010 - May 2010)
Mifos 1.6 (d-release) (May 2010 - July 2010)
See release notes for Mifos 1.6.x
Mifos 1.6.1 (d-release) (July 2010 - Sep 2010)
Mifos 2.0 (e-release) (Sep 2010 - Dec 2010)
See release notes for Mifos 2.0.x