We're continuing to evaluate Aspos Cells for .Net and it's working well. We've run into a problem with a variety of financial functions that aren't supported including: MIRR, Ppmt, Ipmt, Nper, SLN, SYD, and DDB. (BTW, the VB.Net library has definitions for these functions.) While it would be nice to have these implemented, the real problem is that Aspose doesn't appear to correctly pass on to Excel functions which are undefined in Aspose but defined in Excel. These formulas show up as #NAME? but evaluate correctly after typing F2, Enter in Excel. Is there a way to get Aspose to correctly pass along these kinds of functions?