Traditionally celebrated between 18 and 25 January (in the northern hemisphere) or at Pentecost (in the southern hemisphere), the Week of Prayer for Christian Unity mobilises countless congregations and parishes around the world.
The death of Polish President Lech Kaczynski and an entourage in a plane crash in western Russia has united Poles as well as Christian leaders from the country.
A Polish sociologist has urged the Catholic Church to speak out in defence of the poor, after it was revealed as having the highest child poverty rate in the European Union.
Some Catholics in Poland have formed a protest committee in a bid to stop a concert in Warsaw by Madonna on the Feast of the Assumption. But not all see it as a problem.
A Catholic church in Aberdeen facing closure will now remain open, thanks to community appeals and an influx of new parishioners from Poland. The Church is increasingly reliant on new migrant workers.
Poland's Roman Catholic bishops have urged the media to respect the decision of a top archbishop to resign due to accusations that he acted as an informer for Poland's former communist secret police - writes Jonathan Luxmoore for Ecumenical News International.
Archbishop Stanislaw Wielgus has been appointed the new head of the Warsaw Catholic Archdiocese in Poland, in spite of findings by a church commission that he collaborated with the former communist country's secret police.