Http://blog.andreineculau.com/2010/11/pidgin-and-msn-certificate-error-for-omega-contacts-msn-com/#comment-1804
The solution provided by the above website is to download the three files mentioned in the file and put them in this directory. Take my fedora13 as an example:
MV microsoft_internet_authority_2010.pem microsoft_secure_server_authority_2010.pem omega.contacts.msn.com ~ /. Purple/certificates/X509/tls_peers/<br/> If the problem persists, check the following: <br/> Nautilus ~ /. Purple/certificates/X509/tls_peers/<br/> it is very strange that there will be two files named omega.contacts.msn.com, one 2.2kb (built by pidgin) and one 2.3kb. Why do two files with the same file name appear? It is impossible, because the two file names are actually not present (there are several spaces in it that are not found ). <Br/>
# Note that the path must be correct. The Ubuntu path should also be like this. Other Linux system paths may change. You can refer to the above URL.