Changed by permalink structure now stuck on the migration

[Alan Petersen]

Hello,

I setup a blog and I forgot to use the SEO friendly permalinks structure. So I changed it. I installed the advanced permalink plugin which has a migration feature so I don't have to mess with the .htaccess file directly to ensure the old posts don't go 404 on me.

My question is, I can't figure out the Old Permalink structure. It was the default one on WP,/?p=N:
http://example.com/?p=5

I tried the above, plus just leaving it blank, plus just "/" , and "%post_id%" and I get the 404 every time. Any suggestions on what the WP default permalink structure is?

[SteveJohnson]

[Alan Petersen]