Without downloads from the Microsoft servers, many Portfolio columns continue to work because the values are computed from transaction history and quotes. Quotes can be entered by hand, or you can use the PocketSense scripts to download quotes. Most other columns will no longer work, because the data for those is downloaded rather than computed from history and price quotes. Here are columns that I find to be useful, and which work without the Microsoft servers. Symbol, Name, LastPrice, Quantity, MarketValue, Gain, PriceAppreciation PriceAppreciation, TotalAnnualizedReturn, TotalReturn-1Week, TotalReturn-4Weeks, TotalReturn-3Month,TotalReturn-YTD, TotalReturn-3Month,TotalReturn-YTD, TotalReturn-1Year, TotalReturn-3Year, TotalReturn-AllDates, LastTransactionDate, Memo, %OfPortfolio, AverageCost, Commissions, Currency, CurrencyCode, CallDate, BondType.
There are probably some others related to options that will also work.
Some columns, such as %Change and TotalChange will show blank. Others, such as DividendYield and LastTransaction, will display stale data.
To edit which Portfolio columns are used, do Portfolio->ChangePortfolioView->CustomizeCurrentView->PortfolioColumns