Updated with Nokia’s response below. I updated my Nokia N900 to Maemo 1.2 and wanted to start everything from scratch. The first thing I wanted to set up was my email. To get push email on the Nokia N900, I needed to add my Gmail accounts through the Nokia Messaging option. To my surprise, it was not listed as an option after I updated.

Twitter user @JJKLEE suggested to replace my T-Mobile USA SIM card with another card to see Nokia Messaging as an email option on the Nokia N900. I inserted my AT&T SIM and there it was back on the list. I thought I was imagining things, so I put the T-mobile SIM card back on. Nokia Messaging disappeared again!

This could mean Nokia Messaging doesn’t like T-mobile USA… the only provider that can provide 3G for the N900 in the USA! The workaround is to insert a different SIM card, set up Nokia Messaging, then put the T-mobile card back on.

Anyone else experiencing this issue on their Nokia N900 with T-mobile or any other SIM cards?

Update: Davis Fields from the Nokia Messaging team confirmed the issue and assures us they are working on it. Here’s the note he sent:

We are aware (and currently resolving) the fact that you cannot create a new Nokia Messaging account using a US T-Mobile SIM. Should have a fix by next month – realize that’s not a great answer, but, would rather tell you what’s going on than leave you in the dark.