Domain, hosting, and email

This may not be the site for this question

I have a domain name I registered with 1and1. I am using squarespace to host my website, pointing to that domain, and I just signed up for office365, and want to use that for email.

Squarespace provided me with an IP address to set as the A record. I added this on my 1and1 admin console, and was able to access my webpage. Office 365 provided me with two name servers, for my email, and told me this would not change my A record mapping. As soon as I entered the name server information, I was no longer able to bring up my web page at squarespace.

I do not know much about DNS or hosting, so I am not sure if what I want to do is even possible. Though I imagine it would be.
Any help is appreciated.

Answer

ok, so it looks like microsoft does provide authoritative name servers for office 365... and it sounds like you already moved your authoritative name servers over to MS. once you did that, the existing A record for squarespace ceased to exist, as it was not on MS NS's. you have to add that A record to your new authoritative nameservers with microsoft.

http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/hh416759.aspx

http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/jj655390.aspx

the above links should explain the difference between having 1and1 host your dns, and adding the necessary records to make O365 work for your domain, as opposed to having microsoft host your auth ns's.

if you keep microsoft as your authoritative name servers, it is not clear to me that they will let you add an A record to a third party (ie. squarespace IP)

i would probably advise to revert to using 1and1 NS's, and manually add the dns records needed for O365, as per articles above.