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From: GUMBY@MC.LCS.MIT.EDU (David Vinayak Wallace)
Newsgroups: mod.telecom
Subject: Commercial Email:  AT&T, MCI, CompuServe news
Message-ID: <8603200301.AA10435@ucbvax.berkeley.edu>
Date: Thu, 13-Mar-86 00:45:05 EST
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Posted: Thu Mar 13 00:45:05 1986
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    Date: Thu 27 Feb 86 13:42:46-CST
    From: Werner Uhrig <CMP.WERNER at R20.UTEXAS.EDU>
    [ from the Austin American Statesman - Feb 26, 86 ]

    Washington - MCI Communications Corp. and CompuServe Inc on Tuesday linked
    their electronic mail services, creating the world's largest interconnected
    electronic mail network.  Together, the companies serve a half-million
    subscribers.

How does the internet compare?  What about internet+bitnet+uucp+csnet?
That should add up to about 500k.