Decrypt TLS packets

[PiKe]

I've been having issues on and off with Hotmail using the IMAP and POP3 protocols, Microsoft have requested a packet capture but obviously the useful bits are encrypted.

Now whilst they may be able to decrypt it their end as they will have access to the certificate, how can I do it my end so I can see the real packet data and figure out what's going on?

 

[PiKe]

It's not through a browser though, it's through an email client, fiddler doesn't log anything in this instance.