Maybe or may not be

I called invain a friend. I didn't get an answer. So the first sentence is fine in this context.

I am interested in the opposite of the above.

2. He maybe not at home.

3. He may not be at home. 

Which is the correct sentence? It maybe both are fine. 

I called invain a friend.

Why did you alter the word order?

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Yesterday I tried in vain to install Microsoft Windows 2008 server. [ This is correct.]

Yessterday I in vain tried to install ... [ This is not correct.] 

{ Microsoft allows people to download the 60 day trial version of the above product.

It was a tall order to install it.] 

Rotter

I called invain a friend.

Why did you alter the word order?

There is no such word as invain, it's in vain. In English it is safer not to separate an object from the verb. This sometimes happens if the object is long:

I called a friend in vain.

I heard there the language of my childhood.

CB 

Rotter

Yesterday I tried in vain to install Microsoft Windows 2008 server.

You might suggest the following:

Yesterday I tried to install Microsoft Windows 2008 server in vain.

Both are fine. I'm not familiar with computer jargon but I would add an article: ... to install the Microsoft Windows 2008 server.

CB 

Rotter

Thanks Cool Breeze again for taking time to reply me. I firmly remember you because you live in Finland. I am in Sweden.

 

Yesterday I tried in vain to install the Microsoft Windows 2008 server.

So the object is 'to install the Microsoft Windows 2008 server' 

Heja Sverige! Yes, just ask yourself: what did I try? The answer is: to install the Microsoft Windows 2008 server.

CB