salutations - How to address letter to a company

I want to send a letter to a company (specifically Microsoft). I've read some things that say one should write "To whom it may concern". I really don't like this; it sounds pretentious. Other sources suggest writing "Dear Sirs" or "Dear Sir or Madam". I don't care for either of these because in the former case a woman could be reading the letter, and in the latter case my letter could be read by multiple people. "Dear Sirs or Madams" sounds ridiculous. "Dear Microsoft" is obviously laughable (and I'm very apposed to corporate person-hood, hah!).

I've never particularly cared for "Dear" as the beginning to a letter myself. I don't even know who I'm writing to. But what options do I have other than "Dear"?

What should I do?

Answer

Here is how it works if the intended recipient is unknown.

If the gender is unknown, use:

Dear Sir/Madam, Dear Sir or Madam, Dear Madam or Sir; Dear Sirs

If the recipient is male:

Dear Sir

Otherwise,

Dear Madam,

If you want to exclude gender altogether from your letter, then use:

To Whom It May Concern

That said, the important thing is what you write. Nobody is going to care much about what kind of salutation you use.