According to the Eudora for Windows forum
(and to as much personal testing as I could do,
including noting the apparent clearance
of ad graphics from server ads.eudora.com),
Qualcomm seems to have ceased delivery of ads
to Eudora in Sponsored mode.
If left-over ads are still displaying,
it would appear that you can close Eudora
and then delete Eudora's "ads" folder, as detailed in
http://eudora.com/techsupport/kb/1918hq.html
When no ads are displayed, it becomes possible
(at least in the Windows version)
to un-dock and drag the Ad window as far off-screen
as you like, without receiving any "nag" message
that "something seems to be covering the ad."
As far as "reverting to light"
(for older versions of Eudora, before 6.2.4 for Mac)
this seems to take several weeks in Windows version 6,
and can be prevented in Windows by deleting the "ads"
directory sufficiently often, possibly also
by overwriting some of the "settings" by which
Eudora remembers how long you have been using it
without ads, without registering, without profiling, etc.
Enjoy the henceforth "Un-sponsored" mode of Eudora.
-[ ]-
John H Meyers - 03 Mar 2007 04:12 GMT
Apparently the Qualcomm ad server is still operating,
but the only ad seems to be the "upgrade now" admonition
from Qualcomm, recommending the "final" upgrade
to prevent "reverting to Light" for Sponsored users.
This seems to be in accordance with
http://eudora.com/faq/#Sponsored
which reads in part:
"QUALCOMM plans to stop trafficking outside advertising
on February 28, 2007
and all advertising will cease on March 31, 2007"
It has been figured out how to quite easily prevent
any former Windows Eudora version from going back
to "Light" mode (and in Windows one can switch
right back again to Sponsored, anyway); this involves
deleting the "ads" folder sufficiently often,
plus deleting some of the settings which remember
when Eudora was either originally installed
or was last "nagged" about registration, profiling,
or about not getting ads -- I don't know, however, whether
the latter is necessary or feasible in the Mac versions.
If anyone can't use 6.2.4 for Mac OS and needs a solution
to continue in Sponsored mode,
apparently a registration code, from whatever source,
will do, in place of more elaborate technical solutions.
-[ ]-
Daniel Cohen - 06 Mar 2007 16:49 GMT
> When no ads are displayed, it becomes possible
> (at least in the Windows version)
> to un-dock and drag the Ad window as far off-screen
> as you like, without receiving any "nag" message
> that "something seems to be covering the ad."
I couldn't see how to do that on OS 10.4.8. I always kept the ad window
at the bottom right, and if I try to move it so that most of the window
is offscreen it just bounces back.

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John H Meyers - 07 Mar 2007 02:55 GMT
Previously:
> When no ads are displayed, it becomes possible
> (at least in the Windows version)
> to un-dock and drag the Ad window as far off-screen
> as you like, without receiving any "nag" message
> that "something seems to be covering the ad."
> I couldn't see how to do that on OS 10.4.8.
> I always kept the ad window at the bottom right,
> and if I try to move it so that most of the window
> is offscreen, it just bounces back.
I'm sorry to hear that the Mac version isn't as liberal
as the Windows version, where the Ad window can now
be buried totally out of sight.
Meanwhile, what Windows folks have been seeing
is that when using the latest "final" version,
no more ads are presented at all; when using
an older version, no commercial ads are presented,
but Qualcomm has a series of "ads" of its own
trying to "sell" everyone on upgrading to the
final version, to avoid "reverting to Light."
I suppose that there must be some Mac platforms
which can't upgrade; in Windows, we think that
we can stave off this "revert to Light" thing forever,
but it's undoubtedly more challenging to accomplish on Mac OS.
By the way, with the cessation of all commercial ads,
our extra "Ad toolbar" (which held sponsor links)
also disappears.
Best wishes "from the other side" :)