Office 365 File Sharing with outside vendors

I have some files that I want to give external users access to. I don't want random people having access either. I need to know how to do this and what the requirements are. Also these users may already have O365 accounts for their company, I am not yet sure.

Files to be shared must be secure
can live in a shared library
some external users on o365 for different organization
some external users not on o365

Please provide me with any documentation or instructions on how to accomplish this.

Who is Participating?
sharepointguru14Connect With a Mentor Commented:
This is actually fairly easy being that you are using O365. For the users outside of your company is it safe to assume that they have a account? If so then all you will have to do is go to the file (or library if you want to share the entire library) click on the share button in the ribbon, then type in the email addresses of the people you would like to share with. There is a check box that says require sign in. If you want the file to be secured to just the people you invite make sure that is checked. That's it!

There is also a button on the ribbon next to library settings if you want to share the entire library called "Shared With" you can click on that and then click on invite people at the bottom and that will take you to the screen to enter names or email addresses.

Hope this helps
halejr1Author Commented:
Thanks Guru -  Yes it was easy, the dilemma I was facing which I didn't realize at first was application of inherited rights.  So I modified my root and created a completely separate Site, not a sub-site, this is the location with shared content, so my guest vendors don't have access to my main site content, I am able to explicitly allow them access to only the site which I created by joining them to a group created for that site that has contribute access.
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