Cannot change mail POP server

Question

I upgraded to Yosemite and now I can't change POP server address in mail preferences because is grey.
Does anyone have the same problem?

Answer 1

After Two weeks our IT figured out why the iphone would not push through emails.  This happened years ago when we had the Treo Smart Phone.  It's an email capacity issue. 
This Issue has to do with the amount of emails sitting on the web mail.  Our company holds every past email on the webmail, this is thousands of emails, let's put it this way, in one day I alone receive over 200 hundred emails.  When the phone tries to retrieve current emails it is also trying to push through all the emails on the webmail which some phones are incapable of doing over a certain capacity. So you will receive the message "CANNOT GET MAIL, The connection to the server failed".
I.T. resolved this issue by backing up all emails on the Exchange server for each user.  Then Moved all emails off the webmail to a local PC leaving only the current emails sitting in webmail.  Now our IT has to make sure old emails are moved from the webmail weekly, keeping emails in the webmail to a minimum. Now some companies might not be facing any issues because they probably automatically archive old emails on the webmail.  Our IT did not archive old emails from webmail because they thought they would give employees the capability of looking at old emails from webmail not only their PC.  Since this issue, IT found that employees were not accessing webmail for old emails, they were logging into their office PCs to view old emails, so not having old emails on the webmail is not an issue for our company.   And resolving the issue in this manner worked for us.  Not sure if it's a solution for everyone.
P.S. This also effected Calendars, notes, contacts,etc since we resolved the email exchange "Push" issue, all other features are synching too.