Q: How to transfer contact from windows phone to iphone

Transfer the Contacts from your Windows phone to your computer.  Then, use iCloud Control Panel to sync your Contacts from your computer to your iCloud account.  Then, enable iCloud Contacts on your iPhone.

Or you can also Sync the contacts with Google and setup Google Contacts on your iPhone By :

Settings > Mail Contacts and Calendars > Add Account > Other > Add Card DAV account and sign In with you Gmail account.

How do I transfer the contacts to the computer?

SEARCH!!!!
http://lmgtfy.com/?q=transfer+contacts+from+phone+to+iphone

I want to export contacts from Lumia 900. I have forgotten the password for my initial windows live account. I wanted to restore it via sms or email but Microsoft never send me any sms/email. I created a second live account and added it to the Lumia 900. I selected "Synchronise". Then I followed your steps "First sync the Windows Phone contacts to a Microsoft account" until the 8th when none of my contacts were in the address book of my Microsoft account 2. Can you please help me export?

RP

You can export your contacts from Windows Phone first. Google account can be used. Create a Gmail Account. Export your Old VCard files to the Gmail Account. Now Import them from Gmail to your PC. To transfer contacts from Windows Phone to iPhone, you can use iCloud. Open iCloud website and then sigh in your Apple ID. When it is done, you can import the files exported before to iCloud. And then iCloud would sync the information to iPhone automatically.