How to Invest in Microsoft Stock

Open a brokerage account if you do not have one. Alternatively, you can invest 'directly' via Microsoft's transfer agent. Either way, you will need an account which you can use to purchase Microsoft stock from (see Resources below).
Deposit funds in your new account, or if using an existing account, verify that you have sufficient funds to complete your purchase.
Decide how many shares you want purchase, and under what conditions. If you want to buy Microsoft stock today without regard to its current price, you need a market order. If you want to buy only if the price is a certain amount you need a stop or limit order.
Give the order. Whether online, through a broker, or as part of your application, you must instruct the agent to purchase your shares. You must specify the quantity of Microsoft shares you would like to purchase, the type of order to execute (market, limit, stop), and any time limits on the order (Good Til Close or Good Until Canceled).
Verify proper execution of order. Review your trade confirmation to ensure that your order was executed as you instructed.

How to Take Over a Company by Buying Its Stock

Obtain the company's most recent quarterly balance sheet. The company's ownership structure is outlined in the section of the balance sheet entitled stockholders' equity.
Determine the number of shares outstanding. This is a line item in stockholders' equity. It tells you how many units of stocks have been issued. For instance, let's say that company XYZ has 100,000 shares outstanding.
Calculate the number of shares you need to purchase in order to take over the company. Multiply the total number of shares outstanding by .51. In this example the answer is .51 multiplied by 100,000, or 51,000.
Calculate the amount of capital you need to raise in order to purchase a 51 percent stake in the company. Determine the current price of company stock by contacting your stockbroker, the company's investor relations department or by doing your own research. Let's say the current share price is $10. In this example, the total capital needed in order to purchase a 51 percent stake in the company is 51,000 multiplied by $10, or $510,000.
Secure capital. If you don't have the full stake, you can request a bank loan or solicit the help of other investors. As leverage or collateral, look at the current cash position of the company -- the first line item on the balance sheet. This amount can be used to pay off any loans once the company is taken over.
Purchase a 51 percent stake in the company. Contact your stockbroker to do this. She will execute the order in waves in order to minimize the increase in stock price as the stock is being purchased.

How to Buy Stock in Twitter

Check into the websites SharesPost.com and SecondMarket.com. These companies have recently emerged as private stock exchanges for members of private companies who want to sell some of their shares before going public. According to Fox News, 'These exchanges give stakeholders an alternative way to trade their shares in hot startups like Facebook for cold, hard cash --- without having to wait years for an IPO.' Some private companies give their employees shares in order to compensate for an initial inability to pay higher salaries. This option gives those employees a way to see some money more quickly (See References 1).
Do your research on the trends of this type of stock. Will Twitter continue to take off or is it a trend that will soon fade away? It's particularly important to carefully weigh your options if you're considering buying Twitter shares before they go public, since buying through private stock exchanges means buying whole blocks at once. Writer MHB for TheDomains.com explains, 'I'm talking about 60,000 shares at $31 a share comes to an almost $1.9 million dollar investment; no small amount of change.' In other words, if you want to buy stock in Twitter before it goes public, you should be confident in your investment (See References 2).
Register with one of the private stock exchanges. Once you create a profile, you'll be able to see how much other people have paid for shares of Twitter and other privately-owned stocks. Most of these companies also provide you with a report on the company and their current value. It's important to remember that you won't be able to sell your shares until the company goes public, which means you may be sitting on these shares for months or years, in which time the market may shift. 'You might therefore be buying restricted stock for the same price or less than free trading stock is selling for once the company goes public.On the other hand, if you find a hot startup, and get in early, you might make a huge pop down the line if you have the cash to tie up for a while,' says MHB of TheDomains.com. Since the investment is so big, it's important to discuss your decisions with financial advisors before moving forward with the purchase of a block of stocks (See References 2).