The group will celebrate their tenth anniversary by performing four shows at the Christiania Theater in Oslo on December 9, 10, 11 and 12.
A1 enjoyed eight Top 10 singles, including number ones 'Take On Me' and 'Same Old Brand New You', and three Top 20 albums between 1999 and 2002.
Speaking to DS, bandmember Mark Read revealed that Paul Marazzi was unlikely to take part in any comeback shows after originally quitting the group.
"We haven't stayed in touch with Paul quite so much and he might not even be interested anymore," Read said.
"He's been doing his own thing with a new band and we wish him all the best. I wouldn't say the door is wide open for him to come back and join us but it's a little bit ajar."
The band recently sparked rumours of a reunion after performing together on Norwegian television show Allsang på Grensen.
Check back on Monday to read our Whatever happened to...? interview with A1.