Hello,
I have done a lot of research regarding this problem and I posted
everything I collected in the appropriate ticket in pidgin, see [1].
The conclusion is the following:
The problem was probably introduced by an update of the software on the
server side around mid 2009. All contacts added after that time did not
get the "Has you" flag properly set. I got into contact with Microsoft's
MSN Messenger support team regarding this problem and after giving me a
number of more or less useful hints, they admitted that there is a
problem with Messenger and that it is going to be fixed in the next
major release (which was "Windows Live Messenger 2011"). I posted their
answers in [1] and other bug reports linked there-in.
What they actually did in WLM2011, is that they removed the possibility
in WLM2011 to view the list of people who have oneself in their list.
However, the feature is still present in the recently released version
for MacOS X ("Messenger for Mac 8") and does indeed work. Adding a
contact in the Mac version will set the "Has you" flag to "Yes". This
also works between WLM2009 and the Mac version. However, it does not
work when either side is using WLM2011. Obviously WLM2011 is ignoring
the flag completely and also does not alter it even though the server
software still understands the flag and it can be set and unset.
Setting the flag has not working at all in most cases until recently so
I suppose that Microsoft fixed the software on the server side since
they didn't release any new version of WLM2009 as far as I know. And I
definitely observed that the flag was not set properly when using
WLM2009 up until recently.
With Pidgin, the case is a bit difficult. I have recently tested with
pidgin 2.7.4 and I have observed that even though the "Has you" flag is
properly set to "Yes" for one of the chat parties when adding a contact,
it might still show "No" on the other side. Thus, when A adds B in MSN,
Pidgin might report "B has you: Yes" for A but not vice versa ("A has
you: No"). I have not yet figured out what influences the setting of the
flag when using Pidgin but once I know more, I will let you know.
To cut a long story short: The feature works correctly with the current
version for MacOS ("Messenger for Mac 8") and "Windows Live Messenger
2009". It is not set and ignored by "Windows Live Messenger 2011". And
on Pidgin, the flag might only be set for one of the two parties when
adding a contact.
My suggestion would therefore be to not remove the "Has you" flag from
Pidgin since the server software still recognizes it and one can always
assume that if the flag is set to "Yes" that the information is correct
and the other contact has added oneself into his/her contact list.
When the flag shows "No", the information might not be correct, i.e. one
is actually in the contact list of the other party but still listed as
"Has you: No" which is due to either of the parties' clients failing to
properly setting the "Has you" flag to "Yes" which might happen when
using Pidgin when adding a contact, always happens when using WLM2011
and never happens, i.e. works properly, when using WLM2009 or Messenger
for Mac 8.
So there *might* be a bug in Pidgin where it does not exactly behave
like the original clients WLM2009/Messenger for Mac 8 and WLM2011 does
not support the flag anymore.
Regards,
Adrian
[1] http://developer.pidgin.im/ticket/10681
** Bug watch added: Pidgin Trac #10681
http://developer.pidgin.im/ticket/10681
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