Syncing Contacts

[Lazarus]

I was wanting to switch from Yahoo to Windows but afraid it would delete all my contacts and I'd have to start over again. Can anyone pls confirm?

[Youngbinks]

Are you wanting to start syncing your contacts from Outlook?

[Lazarus]

I am currently using Yahoo address book and wanted to switch to using Windows but want to know if it'll erase all my contacts from iPhone and I have to start over.