Since Excel 2007 (Windows) and Excel 2008 (Mac), the number of rows in a .xlsx, .xlsm or .xlsb worksheet is fixed at 1,048,576. That is 2^20. Excel only stores the data and formatting actually used, so there is no penalty for having such a large number of rows in every worksheet. The file format isn't being changed for Excel 2016, so the same maximum number of rows still applies.
Using your money in Ireland: Northern Ireland and the Republic of Ireland have different currencies. In the Republic of Ireland the currency used is the Euro and in Northern Ireland the currency used is the Pound Sterling.
For currency of Northern Ireland and of the whole of Ireland from 1826 to 1928, see Pound sterling. For the coin of the same value, see One pound (Irish coin). The Irish Pound (Irish: Punt Ãireannach) was the currency of Ireland until 2002. Its ISO 4217 code was IEP, and the usual notation was the prefix Â£ (or IRÂ£ where confusion might have arisen with the pound sterling or other pounds). The Irish pound was superseded by the euro on 1 January 1999. Euro currency did not begin circulation until the beginning of 2002.