=== Get the new intermediate certificates ===
Download [/viewmtn/revision/downloadfile/cd236baf6d00f3e1561a40974ce1828b793ea187/share/ca-certs/Microsoft_Internet_Authority_2010.pem Microsoft_Internet_Authority_2010.pem] and [/viewmtn/revision/downloadfile/cd236baf6d00f3e1561a40974ce1828b793ea187/share/ca-certs/Microsoft_Secure_Server_Authority_2010.pem Microsoft_Secure_Server_Authority_2010.pem] then follow the appropriate set of directions below.

=== Windows ===
 * Save the files to C:\Program Files\Pidgin\ca-certs (or C:\Program Files (x86)\Pidgin\ca-certs as appropriate)
 * Restart Pidgin

=== Linux ===
 * Save the files to /usr/share/purple/ca-certs (or /usr/local/share/purple/ca-certs as appropriate)
 * Restart Pidgin

Thanks to Kaurin/SQuID for blogging this solution earlier.