According to
http://www.mobygames.com/game/windows/magic-the-gathering)
In the beginning of 1998 the second expansion to the game; Duels of the planeswalkers was released. (
http://www.mobygames.com/game/windows/magic-the-gathering-duels-of-the-planeswalkers)
According to
http://en.wikipedia.org/wiki/Microprose Microprose were bought by Hasbro Interactive in late 1998.
According to
http://en.wikipedia.org/wiki/Infogrames, Infogrames took over Hasbro Inteactive in 2001, this is when Microprose stopped existing. Later that year Infogrames created the Atari group.
In 2005 Atari sold many of Hasbro's digital rights back to them (although not D&D).
In 2008 Atari was bought out, and re-emerged into Infogrames.
In 2009 Namco Bandai acquired Atari Europe from Infogrames. Later that year Infogrames finally changed name to Atari.
Also an interesting tidbit:
"In summer 2007[citation needed] Interactive Game Group acquired the MicroProse brand from Atari Interactive, Inc, which filed for transfer of trademark protection on December 27, 2007.[8] Interactive Game Group then shared a percentage of the MicroProse brand to I-Drs At in January 2008.[9][10] Claims as to what titles and other intellectual properties were also acquired by the Interactive Game Group from Infogrames remain unverified, and the last verified owner of Microprose properties is Infogrames.[11]"
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http://en.wikipedia.org/wiki/Microprose I hope you found this interesting...