[sync] Root cause for interop isssue Funambol 6.5 vs Horde 4 found, but how to fix?

[Christian Bomhardt]

Hi experts,

now, I managed to find the root cause why syncing of Horde 4 with my 
Funambol 6.5.18 (Windows Mobile) doesn't work (with old Horde Webmail it 
worked fine)

The APIs do (no longer?) support the desired content types:
(see below error output after I added according logging (seems that the 
exception currently thrown in export messages of API is not logged 
accordingly or I have overseen it):

2011-11-08T21:38:49+00:00 ERR: HORDE [kronolith] Kronolith unspported 
content type text/x-s4j-sife [pid 19212 on line 794 of 
"/kronolith/lib/API.php
2011-11-08T21:38:49+00:00 ERR: HORDE [nag] Unsupported Content 
text/x-s4j-sift [pid 19212 on line 1061 of "/nag/lib/API.php
2011-11-08T21:38:49+00:00 ERR: HORDE [mnemo] Mnemo Export unsupported 
Content Type text/x-s4j-sifn [pid 19212 on line 276 of "/mnemo/lib/API.php"

Is it a bug that these content types are (no longer) supported? Any 
hints how to best include it again?

Maybe it would be good to ensure that this error appears in the logs by 
default - at least this would have saved me several hours of trail and 
error...

Thanks a lot,
Christian