Hi,
Currently there isn't a good way to do this. The last forum update limited the My Threads view to 60 days only.
There have been some proposed workarounds, such as using the My Alerts view - but that only works if you've set alerts on all of your threads. People also have suggested using a search engine and targeting the search to social.technet.microsoft.com or social.msdn.microsoft.com.
Personally I have had zero luck with either of these methods.
I see you've already joined in on
my thread in the suggestions forum, but you can also try using the Site Feedback link at the bottom of the page (TechNet branding only, this link doesn't appear if you're viewing this thread in the MSDN branding) to send in a request directly.
I really hope Microsoft will change course on this one, but I'm not holding my breath.
Don't retire TechNet! -
(Don't give up yet - 12,575+ strong and growing)