MicroStrategy generates revenue primarily from its enterprise software business, offering business intelligence, mobile software, and analytics tools. This includes subscriptions, software licenses, and services, totaling about $480M annually (based on recent filings).
However, the company operates at a loss most quarters due to high overhead costs (staff, operations). Incoming cash flow comes mainly from issuing convertible debt and equity (e.g., ATM offerings of common stock MSTR and preferred shares like STRK/STRC), which funds Bitcoin purchases and dividends on preferreds. They hold ~$30B+ in BTC as a treasury asset, but software revenue covers only a fraction of expenses.
For details: MicroStrategy Financials